I try to get as much done when the kids are with their father as possible.
I do batch cooking. Almost all my dinners are from scratch, but totally not fancy. For example, make ziti, double batch, divide in smaller containers and freeze. I have a separate large freezer in basement. Make muffins and freeze, waffles, etc. I have a couple of freezer cookbooks, helped a ton.
I am "on" from the time I pick the kids up at their after school program until the last kid is bed. I've just learned that is how it is. Luckily my kids help me in different ways. My daughter loves to cook with me. My son does bigger tasks (garbage, recycling, bringing in the wood, etc).
I have a fiance that I see when I don't have the kids and sometimes with them. He helps me out when he can, but he is almost an hour away.
Tonight, drive home from work in snow, pick up kids from their dad's, shovel, unload car, bring in wood, start dinner, vac when dinner cooking, try to unfreeze pipe, start load of laundry, serve dinner, and now chilling for a sec while kids are watching tv (no school tom ) so normally homework time. Then baths, etc.
How do I know kids are alright? Good question. Doing well at school, and haven't killed each other.