We are sailing on the Solstice Sept 2, 2022. I downloaded the Celebrity app and it shows on Day 1 the Luminae is open for lunch from 11:30am to 2:00pm (this is for Sept.2 I assume it would be the same for all sailings). It is a great tool for seeing when the different venues on the ship are open. Plus it shows the menus. Since we have not sailed yet I cant say how well it works on the ship. Have a great cruise!
Robert and Patty