Most of mn (me included if I'm honest) don't agree that an affair should work out in the end - the way it starts is so deceitful and absolutely guaranteed to end with people getting hurt that really, a happy ending isn't deserved.
BUT the reality is that people meet and have affairs and sometimes the relationship with affair partner ends up working out.
10 months is enough time for him to have figured out if he's leaving his wife or not.
It's also enough time for you to work out if you're prepared for the fall out either way - either he's going to leave and you're going to be the mistress who destroyed his family, with all the stress that comes with it, or he's going to stay with his wife and you're going to spend your time on pins, waiting for him to be available and wasting your life.
If he hasn't left yet, chances are he isn't going to - unless his wife finds out and forces his hand. You know this.
It's also not healthy to be so available for someone to whom you are a secondary relationship. Stop ditching your friends so you can wait around for this man.
If I'm honest, I think you're setting yourself up for heartbreak no matter what you do but if I were in your shoes, I'd ditch him, spend time with friends etc and heal. Block him everywhere - email, social media, WhatsApp, phone number etc. Go cold Turkey, relying on friends for support if you need it.
Even if he leaves his wife tomorrow, his kids aren't going to like you, he's going to go through a messy divorce, his finances will change, your relationship won't be all free and fun, it'll be balancing time with the kids, doing chores etc. Exactly the circumstances which have resulted in his disengaging at home and having an affair in the first place.