I was told i have congenital bochdalek hernias. what is the likelihood of having surgery?

Probably minor: If you have lived with this to the listed age of 60 yr without complications I doubt if any surgery is eminent or even necessary, ever. When these are a problem it is usually in early infancy when the intestines displace lung tissue abruptly. Your hernia (s) are likely small & just a finding on an x-ray. Bring the issue up with the doc who treats you.