Both UPS and Fedex have a class of service where they deliver to the Post Office. Then the Post Office delivers the package to your home. This is sometimes referred to as “Super Saver” shipping. Some companies use this method as their “free or economy shipping” option. It is almost always slower. And, of course, it is a cheaper method of shipment.
Also, on “Super Saver” shipments, UPS usually sends me an email offering to deliver directly to me (rather than the Post Office) for an added charge of $3.50 or so. I usually just wait the extra day. Oh yes, if I have another “regular” UPS delivery on the same day, they will usually deliver both directly to me.