when does the mail get delivered on saturday depends on the type of USPS service you are using. For regular mail and First-Class Mail, deliveries typically occur between 9 AM and 5 PM, though times may vary based on your location. USPS also offers Priority Mail and Priority Mail Express, which may have different delivery schedules. For those expecting expedited deliveries, such as overnight services, these may arrive later in the day, as USPS strives to fulfill all deliveries before the end of the day on Saturdays.