Got it stamped today
Go to the JFK Bldg. After the security check ,
go straight ahead to the INS section, where they give forms. They
are going to take finger print and signature on for I-?? form.
Take the form and stand in the queue (10mins). At the counter, present the form, passport, 2 INS photo, EAD, advance parole. They shall stamp it right there - do not have to take a number and wait.
Good luck.