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.
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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 & macOS versions are not necessarily ever in sync.
The version of macOS Books I have is 1.18(1642). macOS Mojave 10.14.4