Help, outside help is an absolute must.
I would look into if you could afford to potentially outsource most of the household stuff in your position.
If you're managing the morning school run and will continue to be able to do so, great, but I would personally be wanting someone to take on the mental load of picking up a click and collect order a couple of times a week, collecting the DC from their wrap around care- good to have someone just in case you are going to be home late.
I'd also hope that the same person could potentially get housework done, and prep a meal each evening.
That way, you can come home, have some unwind time with the kids, and you're still getting a nutritious meal each night.
It gets rid of the guilt that often comes with prioritising housework or cooking when you've missed the kids all day and just want to hear about their day.
Ultimately myself and DH both had fairly big jobs, which were unsustainable for us to both do, and keep ontop of the children, house, cooking etc etc.