You’re not alone OP :)
My DS is also 3 and we started potty training at xmas due to pressure from nursery and it hasn’t gone well because:
-He still isn’t telling us when he needs to go for a wee
-He doesn’t seem to care when he is wet
-I have a very clingy newborn and had a c section and haven’t been able to keep up with either dealing with the accidents or making sure he goes to the potty/toilet regularly
-It’s far too cold to take a potty out
In the end nursery could see how stressed I was getting eg they sent him home in pants and he weed himself in the 6 min car journey, got home and had a wet child and screaming hungry newborn.
Current situation is that nursery are putting him in pants during the day and encouraging him to sit on toilet a lot. It varies how much washing i come home with. At home he is in a nappy and i encourage him to do potty when I get a chance, and that is a battle as he mostly says no.
He does also have mild low muscle tone which could be causing the delay. HV told us not to worry about it and just to try later.
I think for me, I’d prefer he was trained by 4, but my ultimate goal is that he is trained for school.