First Disney trip coming up in March for my crew who is 6, 4, 2 and we're so excited. Or maybe mostly Dad

We have ADR at CP for 7:05 pm when Wishes is at 9 pm. I don't think my crew will want to wait around for more than 20 minutes between dinner and start of fireworks. I'm thinking to be able to go outside after dinner and get a good view. Should I try and push back the dinner start time or can I just show up a bit late? I expect they're commonly running late on reservations at this time anyhow and they wouldn't be booking another seating after us. It's not evening Magic Hours.