How to create schedule for the Update Manatement in Azure Automatiuon usin terraform

Question

I'm trying to automate the update manager in Azure Automation using Terraform, but I can't find the information regarding the following 2 points:

1. Schedule created for the updates doesn't work. I assume the problem is that the runbook is missing that defines which machines need to be updated and etc.
2. Can't find information on how to automatically enable this update management for all machines in a specific resource group.

Here is the terraform code that I've done.

#Creates automation account
resource "azurerm_automation_account" "aa" {
  name                = local.autoac
  location            = local.region
  resource_group_name = local.rg

  sku_name = "Basic"

  tags = {
    environment = "test"
  }
}

#Creates the schedule for updates
resource "azurerm_automation_schedule" "std-update" {
  name                    = "Weekly-Sunday-6am"
  resource_group_name     = local.rg
  automation_account_name = azurerm_automation_account.aa.name
  frequency               = "Week"
  interval                = 1
  timezone                = "Europe/Berlin"
  start_time              = "2021-04-28T18:00:15+02:00"
  description             = "Standard schedule for updates"
  week_days               = ["Sunday"]
}

#Creates log analitycs workspace 
resource "azurerm_log_analytics_workspace" "law" {
  name                = local.lawname
  location            = local.region
  resource_group_name = local.rg
  sku                 = "PerGB2018"
  retention_in_days   = 30

  tags = {
    environment = "test"
  }
}

# Link automation account to a Log Analytics Workspace.
resource "azurerm_log_analytics_linked_service" "autoacc_linked_log_workspace" {
  resource_group_name = local.rg
  workspace_id        = azurerm_log_analytics_workspace.law.id
  read_access_id      = azurerm_automation_account.aa.id
}

# Add Updates workspace solution to log analytics
resource "azurerm_log_analytics_solution" "law_solution_updates" {
  resource_group_name   = local.rg
  location              = local.region

  solution_name         = "Updates"
  workspace_resource_id = azurerm_log_analytics_workspace.law.id
  workspace_name        = azurerm_log_analytics_workspace.law.name

  plan {
    publisher = "Microsoft"
    product   = "OMSGallery/Updates"
  }
}

Update regarding the question. I figured out that option to create an update schedule in update managements is not available yet in the Terraform. That's why we need to do this only from the way of the ARM template created in the terraform config. With the help from the previous comment, I was able to create the following schedule:

#Creates schedule for windows VM to update Monthly on 3rd Sunday
 
resource "azurerm_template_deployment" "windows-prod-3rd-Sunday" {
      name                = "windows-prod-3rd-Sunday"
      resource_group_name = local.rg

      template_body = <<DEPLOY
      {
        "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
        "contentVersion": "1.0.0.0",
        "resources": [
          {
              "apiVersion": "2017-05-15-preview",
              "type": "Microsoft.Automation/automationAccounts/softwareUpdateConfigurations",
              "name": "${azurerm_automation_account.aa.name}/windows-prod-3rd-Sunday",
              "properties": {
                  "updateConfiguration": {
                      "operatingSystem": "Windows",
                      "duration": "PT${local.update_max_hours}H",
                      "windows": {
                          "excludedKbNumbers": [
                          ],
                          "includedUpdateClassifications": "${local.update_classifications}",
                          "rebootSetting": "${local.update_reboot_settings}"
                      },
                      "targets": {
                        "azureQueries": [
                          {
                            "scope": [
                              "/subscriptions/${local.subscriptionid}/resourceGroups/${local.rg}",
                              "/subscriptions/${local.subscriptionid}/resourceGroups/${local.rg}",
                              "/subscriptions/${local.subscriptionid}/resourceGroups/${local.rg}"
                            ],
                            "tagSettings": {
                              "tags": {
                                "environment": [
                                  "Prod"
                                ],
                                "updatedate": [
                                  "3rd_Sunday"
                                ]
                              },
                              "filterOperator": "All"
                            },
                            "locations": [
                              "West Europe"
                            ]
                          }
                        ]
                      }
                  },
                  "scheduleInfo": {
                      "frequency": "Month",
                      "startTime": "${local.update_date}T${local.update_time}:00+00:00",
                      "timeZone":  "${local.update_timezone}",
                      "interval": 1,
                      "advancedSchedule": {
                          "monthlyOccurrences": [
                              {
                                "occurrence": "${local.sunday_3}",
                                "day": "${local.update_day}"
                              }
                          ]
                      }
                  }
              }
          }
        ]
      }
DEPLOY

      deployment_mode = "Incremental"
    }