Just an update for all-
H1B Extension submitted on 22nd January 2019 @ WAC
Got receipt on 27th Jan 2019
converted to Premium on 27th March
Got RFE on 3rd April
Responded to RFE on 3rd June
Status online Changed to Approved on 9th June
Status update again on 12th June to Approved.
I have not received I-94 yet though.