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I too can confirm Photo Supreme runs on High Sierra. I'm a new user, still testing before I transition from LR Classic, so I can't say if there any new issues that didn't already exist. However, I won't be converting to APFS until Apple releases a version that actually works. I tried it on an external HW Raid 5 and DU Verify showed "allocation errors". This is not the case when formatted as Mac OS Extended (Journaled).
Apple iMac (Retina 5K, 27-inch, Late 2015), macOS Mojave, Photo Supreme 4, Lightroom CC Classic.