There's a class of what could be broadly described as personal services, including near real-time home delivery, that a lot of people who aren't uber-wealthy want but will only pay for grudgingly and will try to squeeze as much as possible. In turn, companies that employ the low-skill workers providing those services squeeze their workers as much as possible.

ADDED: I suspect that the fact that a lot of delivery is "free" these days makes at least some people resentful when it's not.

Considering same person probably orders multiple times. You could just tell drivers to mark at their phone when they have for example parked. And then from there calculate average time it takes for them to be back at their cars. Intrusive to them, but could be fair metric.