I hate that I have to ask this but what would my custody likely look like with my situation?

I am a teacher making roughly 46k. I cant afford my house without my husband. I primarily take care of our child because he works longer hours. Our son is 10 months old and still breastfed. In the event of a divorce, I would likely have to sell our home and my car. I still have student loans and some credit card debt. He makes 6 figures. The only “proof” I have against him is that he had 2 DUIs almost 9 years ago. Our relationship is not great, but the most either of us has against each other is in the form of text messages saying nasty things to each other. There are events that have occurred but all we have is our word against each other. He thinks he will get primary custody because of his salary.

Based on that info, what custody arrangement is likely? I know that much more would go into a custody agreement, but I’m just trying to get an idea of what I am facing.