So mine of course is also arriving Friday (20th) & I thought I was all set, since my dad is retired. Figured he'd be home. However, he's gone to bed after informing me he'll be leaving here at noon, to go visit some family. I'll be at work until 1 and then intend to see a movie. UPS tracking oddly enough specifies it'll be delivered at 3pm. Not by 3pm, at 3pm. I've left a note on the door before for a previous phone & it worked fine. I found a 2017 article on here for UPS pre-signature form, which I think I'll print out & use. Can't find that form anywhere on Apple or UPS site.
That said, a co-worker is also getting himself and his wife the new iPhone. He spent a lot of time at work today contacting UPS and Apple. Apple was able to email him a form to post on the door for pre-signatures.