The below written script gives you information of all GPO’s linked to OU’s in your domain.

Get list of all OU's under the domain
 $OUs = Get-ADOrganizationalUnit -Filter * -SearchBase "OU=OUName,DC=domain,DC=local" -Properties *
 Variable Declaration
 $__FinalGPOList = @()
 Loop through each OU and get the linked GPO
 foreach($OU in $OUs)
     $__GPOLink = @{}
     $__OUGPInheritance = Get-GPInheritance -Target $ou.DistinguishedName 
     $__GPOLink = $__OUGPInheritance |          select -ExpandProperty GpoLinks |
         select @{Name = "GPOName"; Expression = {$_.DisplayName}}, @{Name = "OU_DN"; Expression = {$_.Target}}, Order, Enabled
 Along with the GPO name, OU Distinguished Name, Link Order and Enabled status, below code gives details
 of OU canonical name and OU inheritance details.
 $__GPOLink | % { $_ | Add-Member -MemberType NoteProperty -Name OU -Value $OU.CanonicalName } $__GPOLink | % { $_ | Add-Member -MemberType NoteProperty -Name InheritanceBlocked -Value $__OUGPInheritance.GpoInheritanceBlocked } $__GPOLink $__FinalGPOList += $__GPOLink
 $__FinalGPOList | select OU, GPOName, Order, InheritanceBlocked, Enabled | Export-Csv C:\Users\admin\Desktop\gpo.csv -NoTypeInformation

Thank you for reading my post and hope it is helpful to you.