People talk about disadvantaged children sliding behind are children whose parents didn't engage with education when schools were open and don't engage now.
So children whose parents didn't regularly read to them and listen to them read regularly when schools were open are probably not doing it now. Op are you reading with them and listening to them read on a daily basis - that makes a big difference.
I was always amazed how rarely lots of parents did this....that they hadn't realised that if it happen 7 days a week, 52 weeks a year, it just doesn't feel like work to anyone, just life. Battles tend to happen when something is irregular, so routines make a huge difference even if it's a short routine.
What about some of the online maths programmes - even by going over stuff they have done before on these,nit will stop them slipping behind and going backwards.
So to be honest, with primary, I'd focus on doing some literacy and numeracy each day. Some reading, some writing and some numeracy will be good enough. If you don't do 25 projects it really won't matter. Those can be fun (or not) but it's the reading,meriting and numeracy that you need to keep going.
I think that not engaging in these 3 key areas is a mistake. It isn't just that children's progress will stall, but they will go backwards. It doesn't need hours and hours - even 20 mins of reading and 20 of writing and 20 of numeracy will keep things going. But if that hour is missing I think the problems are building.