Sounds like you have it nailed. Sounds like your making all the right choices.
Don't be surprised if he flakes, and remember a break doesn't ha e to mean zero contact. Unless you struggle with boundaries, in which case it may be easier to put strict rules in place, limiting texts and calls Etc.
I am going to refer again to my current situation and confirm, that we live an hour away from each other.
We meet once a week, I stay over once a month.
We say good morning and good night over the phone.

All the rest of the time we know we need to stay focused on ourselves. In my case on being a mum too.
I really hoped it all works out, give him time to adjust and don't listen to any gut reactions he has if they are negative. He will almost certainly think your backing out trying to create walls to cut him off.
Only time will show him that's not what's happening.

Lots of positive thoughts and goodwill. Wishing you all the best for your future.