I have found this part and have implemented it. It is more the second highlighted section that has thrown me; I cannot see how to select to upgrade a device from say iOS11.4 to (for example) 12.0 or 12.1 or 12.1.1.
I think the only 2 update options you have are 12.1.1 and 12.1.2 with anything older no longer being signed. Given that 2.1.X revisions are minor or security related they might now allow you to pick one or the other, but that is a guess. The other option I can think of is that another option has been enables like block updates or something like that which impacts the delay option. I'm betting it has to do with there only being the one major release currently you only get the option to delay.
Thanks for taking a look. And you might be on to something about iOS 12.1.1 being the only signed version available at the moment. But even when iOS 12.1 was still signed (24 hours ago) no choice appeared in both iOS update commands places.
@MerakiEmployee - Could any clarify be given here?
Looks like Apple are looking to kill iOS 12.0 and 12.1 quickly given the comments by the jailbreak community. Looks like they missed iOS 12.1 beta 2. This version is still signed...*sigh*