Apple’s Developer site has currently common a sign that starting Jan 1st, 2018 32-bit Mac apps will no longer be accepted.
Earlier in a year we reported that iOS 11 would be a genocide blow to all 32-bit mobile apps and that a same would request for Mac apps with macOS High Sierra in a future.
Starting Jan 1, all new apps submitted to a Mac App Store contingency support 64-bit architecture, while existent apps contingency be updated to 64-bit by Jun 2018. Apple recommends that if we discharge your app outward of a App Store we should refurbish your app to run 64-bit as well. This is due to a fact that macOS High Sierra will be a final macOS recover to support 32-bit architecture.
Apple also common a support site for distributing Mac apps.
As a reminder, new apps submitted to a Mac App Store contingency support 64-bit starting Jan 2018, and Mac app updates and existent apps contingency support 64-bit starting June 2018. If we discharge your apps outward a Mac App Store, we rarely suggest distributing 64-bit binaries to make certain your users can continue to run your apps on destiny versions of macOS. The final macOS recover to support 32-bit apps but concede is macOS High Sierra.