A company my wife orders from use to ship FedEx SmartPost (last mile was to be USPS). Even though the program ended (and had a name change), the company continued to use it but FedEx was the one who has been doing the last mile delivery. Service was super slow.
Today’s order from them shows DHL with USPS being the last mile. It will be interesting to see how long it takes now compared to what FedEx was doing.