so i do have a psd file for the iphone x but that's not what i used for this. sadly, i used a saved image that i found that's just a jpeg and individually inserted the little icons above (tedious, i know.
HOWEVER, the reason i did this was because i didn't have a psd file for an older iphone version. if you take a look at the image that i used for the home screen, it's actually just a regular rectangle shape with the icons. essentially, that means that you can use any iphone psd file along with your backgrounds as long as you align the icons correctly. the iphone x background/shape is separate from the home screen.
if you'd like the iphone x psd file i have, i can link you to it, but it's not what i used and i don't know how effective it would be since i didn't go through and use it/learn much about it.