Does macOS 10.13.4 display 32-bit warnings like the beta versions do?
Yes, after midnight, April 12, 2018 in the user's local time zone
From Ars Technica's &quot;Apple has begun notifying macOS users of coming 32-bit app incompatibility&quot;.

Starting at midnight April 12, 2018 in the user's local time zone, they will see the following message the first time they launch an app that only supports 32-bit in macOS High Sierra 10.13.4:

This app needs to be updated by its developer to improve compatibility.

Along with that message, they'll see a &quot;learn more&quot; link that takes them to Apple's support page on the subject with more information. The support page broadly explains Apple's plans to &quot;eventually&quot; require all Mac software to be 64-bit.