Father of my child still married

I've been with my boyfriend for two years. We're about to have our first child together and his legal divorce papers are finally being worked through. He isn't handling the situation, his "wife" and or ex (however you want to label it) said she is dealing with it. She is because she cheated and it was decided upon them both that she would seek out a lawyer. I just don't know how serious they are taking it. Should I put my foot down and tell my boyfriend it has to happen because it is no longer fair to me or continue to be patient? It doesn't really affect our relationship considering she is with her own man and he is with me, but they do have two kids together so she'll always be in the picture no matter what. Im just bothered that we aren't engaged because I told him I'd never accept a ring while another woman has his last name. I don't know if it is because my hormones or just spending my free time thinking about it, but today I'm really upset that when the baby is born, I still wont be engaged to the man I love because of his legal status with another woman. I won't be able to look forward to a surprise engagement because he knows how I feel. Don't get me wrong, I knew this all coming into the relationship. I just didn't know it would still be a concern two and a half years later. Sorry for the rant everyone, just needed to vent today.