I'm at my wits end

Edit to add: Right off the bat the first comment here was "tHaTs PaRenT hOoD". I am NOT struggling with being a parent. I am STRUGGLING with having a spouse who is NOT pulling his weight. So unless you have been in a situation like this and have advice for how to get through, things to try/tips, etc. then please keep your parent shaming and judgmental overtones to yourself.

First time poster in desperate need of some outside perspectives.

Some background info: My husband and I both work full-time M-F. We have two young kids (under 3). Daycare is outrageously expensive so we've worked it out that I WFH during the day and he works a late shift until midnight. The goal was he could be here during the day while I work and then I could be here in the evenings while he works.

I get up with the kids every morning.
Every. Single. Morning.
Monday - Sunday.
I get no days off. He sleeps in even on the weekends or I have to poke and prod him to get up. He pulls an attitude if he has to get up and I HATE that I have to have an argument first thing in the morning.

He's supposed to watch the kids during the day so I can work but instead he ends up sleeping until 11am most days. I understand needing 8 hours of sleep, but he comes home, showers, and goes to bed around 1-1:30am. I need to start my work day as early as possible and most days I'm trying to get work done while caring for children simultaneously. When he does finally get up, he takes an hour long shower, gets dressed, etc etc. I swear he waits until the kids have had lunch and are down for their naps to finally show up. Then he plops down on the couch and that's all for him until it's time to get ready for work. Rinse and repeat.

At this point, the entirety of the domestic labor is on my shoulders too. I'm talking loading and unloading dishes, taking trash out, the laundry, cooking all the meals, cleaning the kitchen and sweeping/mopping, and cleaning the bathrooms.

After I get the kids to bed, I am rushing to get the house back in order and completing as much work as possible before I go to bed. Most nights I'm still up when he gets home. I work on the weekends to get caught up/head start.

This isn't sustainable. I've tried and tried and tried for years to get him to see how unfair this is to me but I've reached my breaking point. Most days I am just sobbing at my desk because I'm so overwhelmed. Our marriage is trash and the resentment has built to the point where I can no longer deal with it. I think this marriage is over. I don't understand why he can't, at the very least, take on the domestic and child care tasks during the weekends so I can get some work done. I guess because he's benefiting from this inequality there's no reason to change anything. But if you really loved someone, wouldn't you want to make sure your spouse was feeling supported? I'm not asking him to forfeit sleep or spend his whole weekend doing chores, but that's essentially what's happening to me. I sleep 6 hours and spend all weekend working non-stop just to keep thing afloat. If we split these tasks then neither of us would be the sole caretaker.

Anyone else been through this situation and been happier on the other side? Is it just the phase of life? Idk how else I can communicate my needs. We've done therapy, we've played the Fair-Play game, we've talked endlessly; nothing has ever come of it. I'm just too exhausted to keep trying.

tl;dr I'm a single wife and mom and I'm OVER it