You guys are not the only one.
Sent: Sept 19, 2021
Delivered: Sept 24, 2021
USCIS Received: Sept 26, 2021
Check cashed by USCIS: Sept 28, 2021
NOA with extension received: Oct 1, 2021
Biometrics waiver letter received: Nov 6, 2021
No updates in myuscis.