Why don't you call your lawyer to find out?

Most of the lawyers will ask the client to pay off all the fees before they send out your 485 application. You should know how much you still owe the lawyer. If you cannot remember it clearly, call your lawyer to find it out. There is nothing wrong about that.

If your 485 has been pending for 2.5 years, chances are you will get approved soon. Getting a good job is much more important than paying a few hundred bucks for the EAD renewal.