So far it doesn’t sound like it affects displays that connect directly to Macs using mini DisplayPort or Thunderbolt.
Apple Releases macOS High Sierra 10.13.4 with Business Chat, eGPUs, Messages on iCloud, More
In addition to going hand in hand with iOS 11.3, which was released earlier in the day, the update features Business Chat, support for external GPUs (eGPUs), Messages on iCloud, and more.
Leaked macOS 10.13.4 Release Notes Highlight eGPU, Messages Business Chat Support
What looks like the final release notes for macOS 10.13.4 were accidentally leaked in French, and show that support for external graphics processors will finally be here, along with Business Chat in Messages.
