The Apple A12 Bionic is a 64-bit ARM-based system on a chip designed by Apple Inc., part of the Apple silicon series, It first appeared in the iPhone XS and XS Max, iPhone XR, iPad Air, iPad Mini, iPad and Apple TV 4K. From Wikipedia
Reports suggest Appleās upcoming iOS update will exclude 2018 models, marking the end of updates for devices with the A12 Bionic chip.