+1 for this thread
I saw the "zero day" support for iOS 11 on the Meraki blog, so I was hopeful there would be a similar situation on Sept 25. If I have a Mac running Sierra, the config profiles continue to work after the machine is updated to 10.13, but I can confirm that doing a clean install of High Sierra does not allow enrollment in Systems Managers (either manually or through DEP).
Reading through Apple's developer documentation on High Sierra I got excited for additional mdm support (escrow of FileVault keys and delayed sw updates) but it seems we'll have to wait 😞