Another way to check to see if your approval might be "on the way" is to check the FAA Airman Registry. It's not an official confirmation but it's just another way to see if things have changed. The medical information will switch from "no medical" to the new status.
I know it's COVID-19 and all but I would be surprised if it took longer than 90 days considering it's an AASI and as you mentioned a simple case. Not sure why they would want to drag their feet on this one. There are plenty of complicated cases for them to review longer. I wish you the best and a speedy resolution in FAA speak.