Hi Ron,
No PSP client as of now. Stats are updated every hour. If you finish the work unit after it's deadline, which can happen if you turn off Folding at Home, or your network is down, the client will show how many work units it did, but this will not be reflected in the stats page. I believe the reason for this is that the work unit you were working on is reassigned to another participant after the deadline.
Regards,
Al