In summary, USPS does deliver on Sundays, but only for Priority Mail Express and eligible Amazon packages. For all other mail types, delivery resumes on Monday. Always rely on www.USPStracking.us USPS tracking to stay updated on your shipment.
Yes, USPS does deliver on Saturdays. In fact, Saturday delivery is a standard part of USPS operations, and most residential and commercial addresses in the U.S. receive mail six days a week—Monday through Saturday.