What is the current latest version of Apple's Books app for macOS? In the Books app on my Mac, About Books reports the version as version 1.16. Is this the current latest version?

I am running macOS 10.14. Wikipedia article for Apple Books mentions version 4.1 of iBooks for iOS.
I have v1.19, but I'm on a beta 10.14.5, so I don't know whether that's the generally-available 'latest'.

Note, though, that iOS &amp; macOS versions are not necessarily ever in sync.