Does that work? I’d expect you want to do a fairly traditional road-based ETA? Otherwise you’ll be wildly off if you’re in a cul de sac next to a major highway or on said highway, or in massive traffic vs not at all.
It's more to figure out how many couriers are in a given cell at a given time, and track that data over time so it can be forecasted.
Then we can say if you need a package collecting at address X, there are usually Y available couriers within Z distance. Combine that with a road mapping/traffic API and you're done.
