Running PowerShell script immediately after BE job finishes

Hi, I have Backup Exec 2012 in my company. Among many jobs there is one for backing up Exchange Server 2010 IIS logs. Since I want to delete these log files after they are backed up (kind of archiving) I can write simply PowerShell script to delete all these files except the newest one (which is locked since it is used by Exchange). It would be nice if there is possibility to run this script automatically immediately after backup job is finished. Is this doable in Backup Exec 2012?

I know there are pre/post commands - does this mean that as a command I can use: C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe -Noninteractive -File "C:\Delete-IISLogFiles.ps1"?