Some creativity needed here. Glass could help server see which tables have been waited and when they last ordered. Chefs could see incoming orders and see the time when it came in. Algorithms could help with suggestions on what activity to do next for max efficiency etc.

I would argue AR would effectively be able to be more productive and faster with minimal effort. Once form factors are fixed at least

You have plenty of chefs working in massive kitchens serving huge amounts of people (cruise ships, hotels, …)