I've got a 2 year old and a 5 month old so I feel your pain. My advice is plan as much as you can, and try to get out for a walk at least once a day. If you dont have symptoms you're fine to go out into open spaces, are there any fields or parks nearby where dc can run around?
There are loads and loads of craft and activity ideas on pinterest you can do with household items, for example we made playdough with store cupboard ingredients last weekend, which was fun. You can print pictures online to colour in too.
Also simple things are effective. DH was making a pie and gave 2 year old some scraps of pastry to 'help' with, that kept him occupied for ages.
Go through the kids toys, take some away and dig out some of the ones they havent played with much recently. In a couple of weeks rotate them so that there is still some novelty.
Now is a good time to plant seeds as well so maybe get the older one involved with that, grow some cress or other veggies if you have a bit of space.
Dont feel bad about putting on the tv for a little while, if you're worried there are loads of youtube videos for counting, alphabet and kids exercises and dances so it's not all paw patrol and peppa.
Good luck, I'm expecting to be in the same position some time in the next few days.