Most transport category planes are certified for 2G’s. During a check ride steep turns are at 45 degrees of bank. Then I believe the FAA standard for ultimate failure is at 1.5 times the 2G limit.
My wife gets mad at me when she notices wing flex in turbulence and I tell her there is nothing to worry about when the wing is flexing, it’s when the wing stops flexing then you have something to worry about.