Ah, indeed that is very different. Prime now guarantees a delivery window of 1 hr (for a fee) or 2 hr (free for Prime members), and gives you tracking in the app (not a link), but delivery is same day, and you pick the delivery slot (if one is available).

Honestly, many people don't care exactly when their parcels arrive -- they can order it to work, or their concierge/front desk can hold it, or it can be left at their door/porch. And if you care about this sort of thing, it may be just as economical to move into "luxury" apartments that provide this sort of perk as it is to pay for something like BufferBox that provides a proxy of it.