Yup! The only reason why it's not today is because we couldn't get a formula merged into mainline homebrew until the download link was public. It is now though, so we'll sort this out soon. Now that you mention it though, this would be a pretty easy, high-impact contribution that a community member could make as well!
From the wiki, it says it will soon be available on homebrew as well.
https://github.com/facebook/osquery/wiki/install-os-x