I think the recipt date for EAD was April 20 or something close. I had filed for EAD along with I-485 form. After 90 days were over, I went to local INS office and got iEAD card. It is good that I got the iEAD since INS issued an RFE on my actual EAD card right after I got the iEAD. I was laid off from my previous job and managed to find and start a new job based on iEAD. If I wouldn't have got an iEAD I would have pretty much been screwed with respect to finding and starting the new job. Processing RFE on EAD took more than usual amount of time since I never got the first RFE notice. I had to call INS a couple of times before I got the RFE notice for photographs.
After getting my address changed and responding to the RFE sometime in mid October, things went smoothly and I got the actual EAD in last week of November.
Hope this helps those who are in similar situation specially given the uncertain nature of EAD processing at INS currently.