You can now download iPhone 12 and iPhone 12 Pro device frames from Apple’s design resources website.
iPhone 12 Device Frames
These frames can be used by developers to show how their apps will look on Apple devices in their App Store screenshots. They can also be used in shortcuts for the same purpose: Making your screenshots look more polished.
iPhone 12 device frames are available as well as another configuration that combines the iPhone 12 Pro and 12.9-inch iPad Pro. The frames are available in white and silver, but not gold or graphite.