first, I am not familiar about your type.
but I think your I-485 is based on employement, right?
I got two frineds, their I-485 RD are 08/2003 and 12/2003. both of them got 485 approved recently.
my understanding is NSC now is working on I485 which RD is around end of 2003. That's my understanding. their actual process dates are always faster then what they posted.
goog luck on your case