How to wait/pause/sleep the script processing in powershell.
Start-Sleep cmdlet is
    Syntax:
    
    Start-Sleep [-seconds] int [CommonParameters]
    
    Start-Sleep -milliseconds int [CommonParameters]
    There is an alternate way to pause the execution which wait until the user presses a any key.
    
    This can be achieve using the command.
Note: But this commands works in powershell command shell not in powershell ISE.
Also you can wait on the job to finish with a timeout.
Example
$comp = Get-ADComputer -filt *                                      #credentials and AD filter
$cred = Get-Credential PC\administrator                             #create credentials variable
$session = New-PSSession -cn $comp.name -cred $cred                 #create session
$job = icm -Session $session -ScriptBlock {gpupdate /force} -AsJob  #create job
Wait-Job $job -Timeout 60                                           #wait job for 60 seconds 
Remove-PSSession $session                                           #remove session
Restart-Computer $comp.name