What are the chances of early delivery?

Hello! So I'm 30w2d, and baby has been measuring 2-3 weeks ahead in weight, size, and development since around week 17. I know these scans aren't always accurate, but I was 8lbs 9oz and my boyfriend was almost 10lbs, which I know plays a role in how big he'll most likely be. I was just wondering if anyone's been in a similar situation and delivered early because of it? I'd like to keep him in as long as possible, I just want to know what the chances are. First pregnancy. Thank you!