I want a quick test to determine if any of the updates I’d approved hadn’t been installed on all of the relevant machines.
Get-WsusUpdate -Approval Approved | where InstalledOrNotApplicablePercentage -ne 100
Get the list of approved updates and filter on the InstalledOrNotApplicablePercentage
If anything does show up you can dig further to determine what hasn’t installed where
Richard Siddaway's Blog 