That's easier to do with training, and the business is usually more willing than a consumer as it increases their business. Anecdotally, see how many of them (at least locally to myself) have adopted the doordash/grubhub tablets in their kitchen ordering system. I imagine it would be a co-packing situation with lockers on wheels similar to the vehicle KFC uses in China: https://www.mashed.com/284555/the-futuristic-way-kfc-is-sell...

Uber's NURO seems to be developing a vehicle with a similar form factor as seen on this page: https://www.nuro.ai/first-responders

EDIT: see comment below, uber does not own NURO

Nuro is an independent company from Uber, the latter just has a partnership with and some investment in the former. Uber has similar relationships with more than half the industry at this point.

My anecdotal evidence also has so many incorrect orders that I'm a wee bit less optimistic than you about restaurant-side human handling of the first meters. :)