How can I list the features of a pool?
With zfs get all <pool> I can see the list of properties and their values of a pool. But not the features: https://openzfs.github.io/openzfs-docs/man/7/zpool-features.7.html
Google brought me to your question because I was wondering the same thing... except when I get all, I see both options and features.
Feature syntax has appears to have a feature@<featurename> appearance. All of my test pool's features were listed after the options, at the bottom of the wall of text that zpool get all generated.