Seems like a basically solid concept, though I don’t know how nice it’ll play with the multitude of overlays already trying to layer themselves over our games - I usually have Discord overlayed for example, and sometimes Steam or Origin or Uplay or whatever is trying to get involved.
It seems like a major challenge would be getting it to hook into the different delivery services around the world. For example, here in the UK, it’d need to do Deliveroo, UberEats, Just Eat, and probably the pizza places at a dead minimum, and they fairly often update their delivery UIs and so on (no idea if they have APIs to hook into or something). Perhaps they’d pay you to do so? But you might need a certain level of success first.
Conceptually it’s certainly a good idea - right now I often use my laptop to show the progress of such orders whilst gaming, and it would be helpful, particularly in more involving games, to have the notifications come up on-screen.