If you can get her 50-50 time with the kids offer in writing and started in the implementation, then the next hurdle is getting a plan to ramp up your career. At your age it's not easy, but you're better off than most women entering the job force for the first time in their 50s.
If you have a plan, that's a good start. Have you figured out what you want to do in order to become self-supporting, and what it's going to take to get there?