Idk what your evening schedule looks like but one thing we have started doing is to have my husband take care of our daughter till he goes to bed around ten. It's just 2 hours but it's really helped me to have time to get ready for bed and take a nice shower. Then I will sit down and watch a episode or do some reading with some tea. It has done a world of good for my peace of mind.
I feel you, I am in the same boat. My partner also is under high pressure with his job and I can’t 100% rely on his support. Family support is sparse… mum guilt is real but I am sort of looking forward when his nursery starts. 🙈
I took a short while today to try and get a hand full of seeds planted. I guess I just need to keep trying to grab some moments here and there. Our schedule is kind of dumb. My husband starts work a little after 6 a couple days and at seven on others. I know it's not soooooo early, but we both get up extra early to get ourselves ready, to get our girl ready and I have to get my mom (who's in her 80s) up and make her breakfast before we go. We try to have about 30-45 minutes to sit and relax with our daughter before leaving since she's way too cranky if we just get up and go. My husband starts nodding off with the white noise for our daughter. He's usually asleep before my daughter. Plus she hasn't properly settled down with him trying to get her to bed since she was 3 months.
You don't need to feel guilty for wanting some time for yourself. All Mum's need time to relax at some point. Otherwise, we are pouring from an empty cup, which isn't good for anyone x