Wooww so many!
Those tall ones (columnar) cacti are either way harder to bloom, or take much longer to reach the blooming size. I have some similar ones to yours and they never did. They are still very pretty though :)
I read somewhere that some need up to 40-70 years to reach maturity (I think it was about Saguaro cactus). I don't think it's any of yours. But just to give an example :p

P.S. I like the white covers :)