I think it depends, for example if you look up Tony's menu on this website it say it will vary with the park hours, but if you look up Coral Reef it closes at
8pm. I don't think that if a park closes at 7pm though you would be able to make an ADR for 7pm.
I am not sure if you are 180 days out yet, but if not I would wait until you are, bc you can make plans now, but the park hours may be different than you expect when it comes out or the ADR time slot you want many not be available. If you are under 180 days, I would just call now and find out what ADR times are available and then figure our your schedule before you book them.