iOS 12 the Apple company has implemented a very interesting novelty for Software Updates, Software Updates, they can now be done automatically by iDevices. More precisely, you can see in the image below a new function that is available for iPhone and iPad in the menu dedicated to Software Updates, it can be activated to allow automatic updates.
iOS 12 should automatically install any update offered by Apple for iPhone and iPad, without us being asked if we want to do it or not. Until now, Apple displayed notifications for those who had available Software Updates, but the installation was not done immediately, so now everything is automated so that we have the news available as quickly as possible.