If the FP is due after 120 days of filing 485, u shd talk to the IIO
I guess anything over and above 120 days, you should talk to the IIO to find out the status and see if things are fine. The best thing is to pester ur attorney to call them up rather than u calling.
i remember having read somewhere in this forum that you can fax an inquiry regarding fp. i am not sure though. pls check.
mitwaa