I am in the same boat with MSC. I filed i-751for my wife on May 04 2020. Received NOA and 18 months extension in June 2020 . Since then we did not hear anything from USCIS. No Biometrics !!!
I am doing well brother. No updates. I called USCIS and they told me that, we are not even scheduled for Biometrics yet. We have to wait long time I guess !!!
Sad to hear..was told the same that i am still under processing time but i dont know how long the processing time will take for MSC ..though i contacted senator and yet to hear from him.he said 30 days to hear back from immigration