My AOS was received April 16th. The check was cashed and notice sent. I received the I-797, then the paper with the online access code and then the biometrics appointment. You can see the PDF of the biometrics in your USCIS Documents account tab once it has been scheduled. We decided to also do the I-765 and it was received May 8th and I over the weekend I can see it was received.
I feel like everyone rushed to get their applications in before the increase in fees and that might be why it's taking longer...just my personal opinion.