i have found this site useful during my wait for EAD so sharing my experince this is my second ead but through fresh L2 visa so it was not renewal
27th- October,2015 :- Application mailed with express mail (it was via mail method)
29th October ,2015 :- Application Received updated in status
3rdNov,2015 :-mail received physical and electronic regarding receipt of my application
then the waiting continued
8th Jan,2016:-gave a call to update the address but the customer service asked if i had biometric and raised the request for biometric and address change .Two request were raised
I couriered the AR-11 form physical as well though we could change address online as well
21stjan,2016 :- status received a new card being mailed
22nd Jan,2016 :- status received :- case approved and approval notice mailed
26th Jan,2016 :- i checked my mailbox had received approval notice 1-797 inwhich it was mentioned EAD card will besent via seprate mail .
Also i checked status online which was following :-
On January 26, 2016, we mailed your new card for Receipt Number , to the address you gave us. If you do not receive your card by February 25, 2016, please go to
www.uscis.gov/e-request to request that we send your new card to you.
28th Jan,2016 :- Yipee i received my new ead card by USPS priority mail (Exact 90 days)