I'm also interested in following any replies with good organisation tips.
Like you, I wanted to introduce activities of my own (in our home language) to do with DS1 ever since he was in foundation and found it really difficult to be able to do anything in the small period between school pick up and dinner time with a 1 year old in the house always wanting to play with us as well.
Luckily DS1 is a night owl, and didn't mind doing the activities after DS2 was in bed, but it means he goes to sleep later than most kids his age.
Anyway, what we manage to do is daily reading (he reads the school books to DH, and another in our language to me, I read a longer chapter book to him, and talk about the books, what he thinks is going to happen, what he would do in that situation, and help him with new vocabulary).
For maths, when he was in reception I tried to find games where we could apply the things he was learning (e.g sum swamp for addition and subtraction, snakes and ladders, or made up games with superheroes and villains cards with points that he needed to add or subtract in order to see who was the winner, that kind of thing). With time tables we used apps sometimes (Squeeble is great for this), and some card games like Monster Maths, Fairy tables. We also played other kind of games like pizza fractions, shut the box, your number is up, pop to the shops, etc. He loves maths, and would never complain about having to do maths at home as he sees it as a game. The workbooks haven't been so much a hit with him. So we do the same kind of questions as quick mental maths competitions and he prefers that.
For other subjects, there are some good links that have been posted in MN with the new curriculum for each year on every subject (science, history, maths, literacy, etc). You can use that as a guide to find activities that follow up on what she is learning at school.
In my case, it was a bit tricky as I wanted to follow the curriculum, but at the same time I needed to do it with resources in a different language. So I think I finally found my solution with textbooks in the target language that we can use to read, discuss, and follow up with activities if we want. It has saved me a lot of time doing it that way. But in English, you should be able to find plenty of resources without having to get a textbook that matches the curriculum.
If you search posts by PastSellByDate you'll find lots of useful ideas for math games and websites.
These are the links I have:
resources.woodlands-junior.kent.sch.uk/maths/index.html (free) (e.g dino place value game)
www.bbc.co.uk/bitesize/ks1/ BBC bite site
www.mathszone.co.uk/
www.coolmath-games.com/1-number-games-01.html
And if you go to this thread, you'll find links for the new curriculum for all subjects:
www.mumsnet.com/Talk/primary/2327478-Year-5-expectations-how-much-has-curriculum-changed
Hope this helps you.