Adjustment of Status - I-485

Good evening everyone! I will tell my story later this week on this forum. But I had a question about ASC appointment notice. So I didn't get any mail from USCIS yet but my lawyer office got the mail for form i-797 notice of action(Bio-metric appointment). I called the lawyer office and talked the paralegal; she said you will get all NOA in your mail too; its normal that we received it first & this is happening now for some cases. But wait till next week and if you don't get any mail then you can come pick the one we received. They scheduled my biometric for March 18th. I am not scared but just curious how come no notice of receiving the AOS package or something and now my lawyer office got the notice for bio-metric. Any thought or idea would be really appreciated.

Timeline >
02/17/2020 > AOS sent to CHICAGO USCIS LOCKBOX thru fedex over night sipping
02/19/2020 > Package delivered; signed by J.Harper at USCIS LOCKBOX. (Shipment was delayed due to fedex carrier mechanical problem, so instead of 18th; it was delivered on the 19th.)
03/06/2020 > Got email from my lawyer office regarding Form I-797 Notice of action; Bio metric Scheduled for March 18th 2020

I looked up with the receipt no that I got from lawyer office and it says " Case Was Received" for I-765 & for I-485, It says " Fingerprint Fee Was Received".

Filling from Minneapolis, MN. Again any thought or idea from you guys would be much more appreciated. And congratulation to all those who already passed this long journey and good luck to the others who are like me, either just applied or waiting for approval.

Thanks

:)