Honestly OP, this sounds like a you problem.
First of all, when you talk about "working longer hours", what do you mean?
Do you mean you're working for longer than your contracted hours at work on the basis that you don't have a commute? If so, cut that shit out immediately. Your employer doesn't pay you for pre work time or after work time when you're commuting, so they're not entitled to your pre work time or after work time when you work from home.
When you get up at 6:30am, what do you do? Are you doing household chores and school drop offs before you start work at 9:00am as if you were in the office? If so, you and your husband need to split the difference. He can get up 45 minutes earlier and you can get up 45 minutes later and he pulls his weight.
Or are you starting work earlier so that you can finish earlier (flexible hours) so you can take care of your kids after school? If so, your whole family is gaining a benefit from you structuring your hours in this way, and your husband needs to be picking up the slack in other ways.
I do usually do more housework on my WFH days, but not that much. Usually it's because I have time to do a load of washing before I start work, take a quick break to hang it up, and then put it away at the end of the day when it's dry. But I'm not taking loads of time out of my working day to do that, and I'm certainly not getting up at the crack of dawn to do it while my husband sleeps on the grounds that I WFH and he doesn't. Why would I?
So you need to work out what the actual issue is and do something about it.
Are you working extra hours for your employer because you WFH? If so, don't. Tell them that your workload is too much for one person and you've been putting in extra hours since COVID but you're heading for burnout.
Are you doing more housework and childcare than your husband because you WFH? If so, don't. It is 50% his responsibility. At most you could be doing housework during the time that he commutes on the grounds that you are both doing something falling into the category of "shit that needs to be done but which you aren't getting paid for". Anything you can't get done during his commuting time needs to be split fairly between you.