Apply now. 6000 hours in transport airplanes is all the qualification you need. However, my opinion is far in the minority and United PR will be the ultimate arbiter of what you need. I'd rather fly with you than a guy with a brand new degree and minimal experience in 121 and Intl ops. Now to be fair, there are tons of guys with similar quals AND a degree so you'll be lower in the stack than they are. But, that stack is shrinking fast and your Boeing time will make your resume more buoyant as it shrinks.

Apply now and get started on something that you can show them at the interview which shows them that you're willing to do whatever it takes, even if its not a "normal" progression. It works.

Just one guys opinion.