What is usps arrived at hub sunday?

As an AI language model, I don't have access to specific real-time information on USPS packages and deliveries. However, in general, USPS operates some of its facilities, also known as "hubs," seven days a week, and packages may arrive and depart during any day of the week, including Sundays. The USPS website and tracking service usually provide up-to-date information on the status and estimated delivery time of packages.