You're wrong.
You won't have more to do when he leaves.
My ex generated so much laundry, dishes, mess around the house, that I never caught up.
I work more now he's gone, I do WFH, but I did when he was here and it was unmanageable.
I'm teaching the kids to tidy up and whenever I come home I know that the only mess I will see will either be mine or that of those I adore and care for willingly.
On his time with the baby you will be able to rest and advance your career.
I was with my ex for 7 years and he took the absolute piss out of me every single day. All those things you are saying about yourself, he is saying them too.
I did start to write something of a wakeup call for you, but at the end you started talking about how your life wouldn't be better without him, but it will.
It will be better than you ever imagined because a weight will have been lifted.
What scared me about leaving was not how I would manage, oh I manage, and I enjoy it!
What worried me was contact with the kids, as I didn't want to lose out on time with them.
But in fact, even though I had been so close with them and cared for them 24/7 365 for years, I actually enjoyed the time off, and I didn't think I would. I actually had full blown panic attacks about it whilst going through court.
But it actually served me and made my life better, and made the time with the kids better because I would plan our time better and have more money because I could do more work. I could organise the house, spend time with friends. I visited friends and went on nights out, something I hadn't done in over a decade.
I promise you, your life will be better when he has gone.