I'm in your same situation.
I'm currently on f1 visa and was hoping to get a green card before ertolling for next semester in order to pay less in tuition since I will not be considered an international student anymore.
I've been waiting for 2 months today since my biometrics.
I have already done an info pass 2 weeks ago. It seems that they have my file but the officer in charge hasnt opened it yet.
I explained my situation and the officer at the booth told me that he would have left a note to the officer in charge of my file.
So far no news.