Boyfriend accepting your kids

Ok I need some insight. I’ve been divorced a little over a year. I have 2 kids from my previous relationship. 5 year old and an almost 2 year old. I met and started dating a guy in October of 2019. We’ve been together 6 months now. We are moving VERY slow which I am ok with considering I have kids and just got out of a marriage. Here’s what makes me nervous. He always says he likes me but he doesn’t know what our future holds. I finally asked him, after 6 months, I feel like you should have SOME idea on what you want for our future. He told me he’s worried about taking on 2 kids. That’s a lot. He really likes my kids and honestly is amazing with them. He’s only been around them a handful of times but my daughter adores him. Here’s my question, how long is an acceptable amount of time for a guy you’re dating to realize he can “take on” your kids? Like I understand it’s a huge commitment and it’s a lifelong commitment if we end up together. I don’t expect him to marry me today or anything lol I’m just curious I guess if you’ve been in this situation before, how long did it take til the kids were accepted? I feel like I’m making him out to be terrible lol he really does like my kids. He’ll ask about them during the week or bring them a treat when he comes. I think he’s worried about the money aspect but he has a decent paying job (90k per year) and I take care of my kids financially on my own and I feel I’d continue to if we married. I’m 28 and he’s 29.