getmininginfo will show you that it's working. That's about all you get.
And when you do find a block (it will show up as immature on the main window for a few days before it gets enough confirmations), listtransactions will give you the status of the block as it matures.
Good luck. Aug. 9 - 11, I found 2 blocks each on 2 PCs. Since then, there has been nothing. I was either very lucky, or something changed last week.