I think it will be ok. Can you arrange for a neighbour to be on call in case of emergency so he has someone nearby.
I loved extra responsibility at age 11. Time goes faster if there is structure to the day, even kids tire of endless Netfliz. Maybe find some fun chores and tasks that can be done, eg find a recipe you would like to make at the weekend and make a shopping list, sort out old clothes/games and photo them to sell on eBay (you can post them onto eBay but let him keep the profit), grow some seeds on the windowsill wg cress, some herbs, chilli seeds. They are easy to grow indoors and he can be responsible for them
I keep thinking of my dad, how from age 8 during WW2 he biked miles to school, as a youngster he played in bomb sites, construction sites, on train tracks. Or his group of lads headed to the edge of town and just roamed the countryside. Both his parents worked full time, most of his relatives were useless (supporting the war effort or, later, too grief stricken to help with a young child).
Even when I was a kid, I used to "go knocking" for friends, I'd be gone for hours (I had a wind-up watch that wasnt very reliable, my mum used to despair as she worried when she didnt know where I was and i failed to turn up for tea)
It is so sad that our kids can't be free to explore. We live in strange times.