While you're waiting, check out the menus:
https://disneycruiselineblog.com/menus/
You can see the 3 MDR menus under Fantasy, then scroll down to dinner menus and you should also have Animators Palate: Animation Magic, Captains Gala (2nd/3rd nt in Royal Court), Pirates, and Prince and Princess (2nd/3rd nt in Enchanted Garden) menus. If you have a Pixar cruise then you'll probably have that menu instead of Pirates.
Royal Court has a sit down breakfast and lunch, limited hours, go whenever they're open. Lunch menu changes daily, you can see it on the app. You won't be seated at your regular table and will usually have different servers than dinner. Cabanas has buffet breakfast and lunch. Then there are all the quick service places near the pool open for lunch, and some evening hours--grilled/fried food, pizza, sandwiches, salads, fruit, and of course the soft serve ice cream station! Both Vista Cafe and Cove cafe have free snacks (and upcharge coffee/tea). Pastries during the day and cheese/olives/breadsticks at night. There's also free room service (but please tip the delivery person), breakfast is just continental options. We do breakfast room service if we have an early excursion, hanging the order on the door the night before.