here's a general observation---generally I find it sufficiently useful even with google maps or whatever that gives you rough estimate of total gain during a days ride.
If I know for instance that a days ride over 75kms I'll be climbing 300 meters, that gives me an idea of how hard the day will be. If its 250 or 350 , then it is what it is and its close enough.
If a day is 50 kms and you'll be climbing 2000 meters, then you know you'll be getting your arse kicked all day and your average speed is going to be a lot slower.

to the fellow asking about this topic, you'll see that if you end up doing this trip,, pretty soon you get a feel for how a day is going to be. You learn to factor in wind, heat, how you are feeling that day etc, and while it can be nice to know that during the next day there is a big climb that tops out at 50kms from where yoiu start, then at least you can watch your bike computer distance and be mentally prepared for the climb and reasonably know when its going to end.

going over a next days ride the evening before when you have access to wifi or simply the time before sleeping if you have data, will at least give you a heads up of the next day. Specifically to this topic, if you make some notes like "climb starts at 30k and finishes at 45k" then this generally will lessen how much you need to use your phone for riding info. Less time phone is on, less time in the sun etc.

but like I said, you'll work it out on the road. And if you are terrible at planning or directionally challenged, well, you're going to have lots of time to improve if you do this trip, so it will all work out.