Edgar Su/Reuters
Apple doesn't usually host its own Black Friday deals for iPhones, but stores that sell iPhones do.
For the most part, Black Friday iPhone "discounts" from stores like Target and Walmart come in the form of a store gift card that you can use at the store itself. Meanwhile, BestBuy offers a direct discount off certain iPhones, but the direct discount isn't as high as the gift cards you'd get at other stores.
You'll have to figure out for yourself whether you shop often enough at certain stores to make gift cards worth it, or whether you'd simply take the smaller direct discount.
Alternatively, there's always Apple's Refurbished iPhone Store, where you can get discounts of used iPhones that have been refurbished by Apple itself.
Check out the 2018 Black Friday deals for iPhone: