I think it depends where you live and the item ordered. I live in the suburbs of a larger city where there are sorting facilities and fulfillment centers. Some of my items are delivered with an Amazon van, others come by UPS or our postal service, sometimes from in the same day.
FWIW, we rarely have an issue with the USPS or UPS. Not much seems to come by FedEx, but no particular problems there either. Maybe we've just been lucky, but we've had a lot of deliveries during Covid times. (And I did knock on wood just now, which made the guy at the end of the bar wake up and bark.)