Should I just wait? I mailed my tax return to the address indicated on the cover page. I mailed it on 3/16. The last update was on 3/23 saying it's in transit, but late.

The address mailed to "Department of the Treasury
Internal Revenue Service
Kansas City, MO  xxxxx-xxxx".
The USPS updates:
"Tracking History
March 23, 2021
In Transit, Arriving Late
Your package will arrive later than expected, but is still on its way. It is currently in transit to the next facility.
March 18, 2021, 11:42 pm
Arrived at USPS Regional Facility
KANSAS CITY MO DISTRIBUTION CENTER
March 18, 2021, 11:19 pm
Departed USPS Regional Facility
KANSAS CITY KS NETWORK DISTRIBUTION CENTER
March 18, 2021, 12:34 am
Arrived at USPS Regional Facility
KANSAS CITY KS NETWORK DISTRIBUTION CENTER
March 17, 2021, 4:56 am
Departed USPS Regional Facility
NORTHWEST ROCHESTER NY DISTRIBUTION CENTER
March 16, 2021, 5:42 pm
Arrived at USPS Regional Origin Facility
NORTHWEST ROCHESTER NY DISTRIBUTION CENTER
March 16, 2021, 11:39 am
USPS in possession of item
BUFFALO, NY 14226"