High Sierra updates, to 10.13.1 & iTunes 12.7.1 are available. I don't see the iTunes update on the MacBook Air because I installed the enterprise version 12.6.3 to replace 12.7. Thus I can still control apps ion connected iOS devices. The instruction notes for iTunes 16.6.3.(6) mention that future updates will have to be done manually, today's MAS update list shows this to be true.