I work for UPS. Saturday deliveries are very expensive. Ex. Next Day Air on Mon-Fri would probably be around $50 for this size of box. Saturday Next Day Air would be roughly triple that cost. If we get them to your local hubs in the morning as in where the actual trucks get loaded then there is a good chance of delivery in the morning. I know at my hub we usually do a courtesy upgrade for Apple products since its actually cheaper for a Part Time Saturday driver to deliver than to pay a Full Time driver during the week. Just giving some insider info.
Except when we shipped our watches to work expecting Friday delivery. Office is closed on Saturday but I'll be home. If o try to pick it up at ups they'll say it's on the truck.