Hey, @doitvoluntarily.
My sister has done inventory for stores off and on, and from what I know of it, it's not a bad things for a robot to do when it comes to replacing a human for work. Hers was often temporary or part-time, so she wasn't really making a whole lot. If that's the case generally, then maybe it's the kind of thing a robot should be doing.
As for grocery shopping and delivery, go for it. Some places who have started to do that haven't been doing it so long that they've necessarily been hiring people to specifically do just that. Depending on how popular it really is, there might not be that much demand yet, anyway.
I do see there is an issue with human replacement as robots begin to be used in more and more aspects of different industries. If they keep picking off the part-time or temp jobs, then that might actually be okay, but there's bound to be people who aren't in need of a full-time job, but still want to work.
Automation is a cool thing, and it's been happening for quite sometime, but it looks like it's on the verge of being everywhere all at once, and that might not bode well for human employment if it happens that quickly.