Brains are really not the limiting factor, and yeah, the raw materials for doing this kind of recognition are pretty mature. You'd want some kind of server in any case, but I bet the CV could feasibly be done onboard.

The physical manipulation part would take some work for sure, and the robot itself would be fairly expensive to make, but it's all pretty achievable. You need it to do more than a BobCat while costing less.

It's not "Uber for $sector" but it can be done.