Still going and no obvious ND issues. We are trying but still having at least one accident a day. Mostly he just gets distracted by playing and prioritising fun over bladder needs! My mum says my brother was the same and my step brother’s 3 year old is also the same. Luckily he has only pooed on the potty or toilet since he was 18 months. Some kids won’t be trained until they’re in year r at school so I really wouldn’t stress too much about it (although it does stress me out!) and nursery should be supporting him in toileting and encouraging him. He may just not feel the sensation yet to be able to communicate that he needs to go until it’s too late.
My 3 year old still isn’t potty trained we were so close but then she started holding her wee from 8am-3pm and would only wee in a nappy she suffers from speech delay too I fully understand how stressful it can feel for you tbh I’m stressed too no advice here but can fully relate to your situation ❤️