H4 + H4ead receipt notice timeline

Hey everyone! My lawyer filed my H-4 and H-4 EAD (not concurrently with an H-1B petition) on June 30, and it was delivered to the USCIS lockbox in Tempe, AZ on July 1. How long did it take for you to receive your receipt notice?

My STEM OPT expires on July 17, so I'm getting a little anxious about the timeline.