He knows thats its not practical, he works full time, only free time he has is after 6pm! And weekends. Well kids will be at school from September and they are generally asleep by 7.30pm! So go figure how he is planning to make this work.
If he chooses 50/50 custody, for his 50%, the portion of the problem he's responsible for solving, as a single dad he would has a few big options: 1. put the kids in childcare for the summer and after school--there are programs that follow COVID restrictions and provide socialization and enrichment, 2. work from home more often, 3. leverage his family, or 4. pay you a small amount to watch the kids. Most 50/50 dads I know opt for option #1 or #2. With 50/50 he'd have the money for #1 because he'd pay very little child support.
In that scenario, a stay-at-home mom often returns to work by choice or court order, because she similarly has to solve her problem of maintaining a household while raising the kids.
It's also possible he'll choose to be one of those "one weeknight and every other weekend dad". Then he will pay a high child support and your lifestyle may not change much.