UPS Tests Saturday Delivery as Web Shoppers’ Clout Increases - Bloomberg United Parcel Service Inc. may join its rivals in offering Saturday delivery for standard ground packages, as the company adapts to surging online shopping and an increasing reliance on home-based customers. UPS may need to adopt Saturday delivery to defend against FedEx Corp., which already drops off ground-shipped items at homes that day. So does the venerable U.S. Postal Service, which also makes Sunday deliveries in some markets on behalf of Amazon.com Inc. Many customers prefer receiving items on weekends, and home deliveries are expected to account for more than half of UPS’s total by 2019.