Just a small update: the Powershell cmdlets for Windows Virtual Desktop have been updated & published 3 days ago, on the 17th of September.
The latest version available now is version 1.0.1288.1.
You can update your cmdlets using the Update-Module cmdlet
Update-Module Microsoft.RDInfra.RDPowershell
Or you could install the modules side-by-side using the Install-Module cmdlet with the -Force parameter
Install-Module Microsoft.RDInfra.RDPowershell -Force
More information can be found here:
https://www.powershellgallery.com/packages/Microsoft.RDInfra.RDPowershell/1.0.1288.1