Powershell/PowerCLI - Update VMware Windows template

<#
 .SYNOPSIS
  Script to update Template's Windows Updates

 .DESCRIPTION
  Run this script to convert the template to a VM, start the VM,
  apply all Windows Updates, reboot the VM, upgrade VMTools,
  shutdown the VM, note the activity, and convert the VM back
  to a template.

 .NOTES
  Resource: http://woshub.com/automate-update-windows-vmware-template/
  Saving PowerCLI Credentials: https://www.vgemba.net/vmware/powershell/Saving-PowerCLI-Credentials/

  The Windows Update Powershell Module must be installed on the VM Template:
  Install-Module -Name PSWindowsUpdate
#>


#--------------------------------
# Store Credentials:
#--------------------------------
<#
 .Run the below commands to store credentials if updating creds or running for the first time

 These must be ran from whatever account the scripts will run from (svc_vmware).
 The scheduled task will also need to be ran from this account.

  $VCenterCreds = Get-Credential
  $VCenterCreds | Export-Clixml -Path C:\Scripts\Credentials\VCenterCreds.cred
  $TemplateCreds = Get-Credential
  $TemplateCreds | Export-Clixml -Path C:\Scripts\Credentials\TemplateCreds-Administrator.cred
#>

#--------------------------------
# Variables
#--------------------------------

$VCenterServer = "MyDomain-VCSA"
$VCenterFQDN = "$VCenterServer.mydomain.net"
$VCenterCreds = Import-Clixml -Path C:\Scripts\Credentials\VCenterCreds.cred    # MyDomain\SVC_VMware
$TemplateName = "tmpWIN2019"
$TemplateCreds = Import-Clixml -Path C:\Scripts\Credentials\TemplateCreds-Administrator.cred    # VM's local administrator
$Date = Get-Date -Format "yyyy-MM-dd"
$LogPath = "C:\Scripts\Logs\$VCenterServer.$TemplateName.Updates.$Date.log"


#--------------------------------
# Update Process
#--------------------------------

# Import the PowerCLI module
Import-Module VMware.VimAutomation.Core -ErrorAction SilentlyContinue

#Set to allow working with multiple servers
Set-PowerCLIConfiguration -DefaultVIServerMode multiple -Confirm:$false

# Connect to vCenter
Connect-VIServer -Server $VCenterFQDN -Credential $VCenterCreds

# Convert a template to a VM
Set-Template -Template $TemplateName -ToVM -Confirm:$false -RunAsync

# Make a 15 seconds delay
Start-sleep -s 15 # 15 seconds

# Temporary VM notes
$VMnote = "VMAUTO - CURRENTLY UPDATING VM TEMPLATE. DO NOT TOUCH."
Get-VM $TemplateName|Set-VM -Notes $VMnote -Confirm:$false

# Start the virtual machine
Start-VM -VM $TemplateName | Get-VMQuestion | Set-VMQuestion -DefaultOption -Confirm:$false
Start-sleep -s 60
Wait-Tools -VM $TemplateName # Wait for VMtools to load
Start-sleep -s 15

# Ensure Windows Update Powershell module is installed on VM
Invoke-VMScript -ScriptType PowerShell -ScriptText "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12" -VM $TemplateName -GuestCredential $TemplateCreds | Out-file -Filepath $LogPath -Append
Invoke-VMScript -ScriptType PowerShell -ScriptText "Install-PackageProvider NuGet -Force" -VM $TemplateName -GuestCredential $TemplateCreds | Out-file -Filepath $LogPath -Append
Invoke-VMScript -ScriptType PowerShell -ScriptText "Install-Module -Name PSWindowsUpdate -Force" -VM $TemplateName -GuestCredential $TemplateCreds | Out-file -Filepath $LogPath -Append

# Run the command to install all available updates in the guest OS using VMWare Tools (the update installation log is saved to a file)
Invoke-VMScript -ScriptType PowerShell -ScriptText "Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -AutoReboot" -VM $TemplateName -GuestCredential $TemplateCreds | Out-file -Filepath $LogPath -Append
Start-sleep -s 30 # 30 seconds

# Update VMTools version
Update-Tools -VM $TemplateName -NoReboot

# Clean up the WinSxS component store and optimize the image with DISM
Invoke-VMScript -ScriptType PowerShell -ScriptText "Dism.exe /Online /Cleanup-Image /StartComponentCleanup /ResetBase" -VM $TemplateName -GuestCredential $TemplateCreds
Start-sleep -s 30 # 30 seconds

# Force restart the VM
Restart-VMGuest -VM $TemplateName -Confirm:$false
Start-sleep -s 60
Wait-Tools -VM $TemplateName # Wait for VMtools to load
Start-sleep -s 15

# Update VM Notes
$VMnote = "VMAUTO - $((Get-Date -Format "yyyy/MM/dd HH:MM").ToString()) - Updated Windows and VMware tools."
Get-VM $TemplateName|Set-VM -Notes $VMnote -Confirm:$false

# Shut the VM down and convert it back to the template
Shutdown-VMGuest -VM $TemplateName -Confirm:$false
do { $vmstatus = (get-vm $TemplateName).PowerState ; Start-Sleep -Seconds 5} while ($vmstatus -ne "PoweredOff") # WAIT UNTIL POWERED OFF
Set-VM -VM $TemplateName -ToTemplate -Confirm:$false