The resulsts would be the exit code, which you can control in PS. That and a success/fail status is what you can get.
Alternatively, using powershell monitor you could monitor an output file. To get an message output you should use write-host $message. For SAM to work with this the minimum requirement is to get a statistic write-host "statistic: stats".
So, if you use both, you'll get the statistic and a message.