Need help with out-file addition to powershell script

I'm jumping in at the last minute to migrate some mailboxes off of an exchange server to another online host.  I was given the following script to facilitate the mailbox transfers, but I would like to add some logging so that I can check on progress and/or modify the input file if it needs to be restarted for any reason.  

Basically I just need to know where to put the 'out-file' command in this script:

$users = Import-Csv -Path "users.csv"

If (!$scred) {$scred = Get-Credential "SOURCE CREDENTIALS"}
If (!$tcred) {$tcred = Get-Credential "TARGET CREDENTIALS"}

$users | ForEach-Object {
                $SourceIdentity = $_.Identity
                Start-Transcript -Path "$SourceIdentity.txt" -Append
                Move-XsExchangeMailboxToExchangeOnline –SourceIdentity $SourceIdentity -SourceCredential $scred -
AllowUnsecureConnection -GlobalCatalog "GLOBAL CATALOG SERVER"  -TargetCredential $tcred -

Verbose
                Stop-Transcript
}

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That way I can just keep an eye on the output and modify the input file to remove completed users if the task needs to be restarted.

Thanks!