You can check your S&S on the Hub app, same with the shore excursions.
Honestly, you don’t have to spend a lot of time on your hub app. We made reservations for restaurants and a massage before we boarded the ship. I looked at it a few times a day to confirm particular events we wanted to do, while DH napped or when I was in line to get a coffee. I would check my favorited activities when I was looking at a menu or something.