It's been a busy few weeks for iPhone updates, with the iOS 16.6 update coming less than two weeks after the release of iOS 16.5.1 (c) Rapid Security Response Update, which itself came a few days after iOS 16.5.1 (a) was pulled because it broke the Safari browser when used to visit websites like Facebook, Instagram, and Zoom.
Released alongside iOS 16.6 for the iPhone is iPadOS 16.6 for the iPad, iOS 15.7.8 and iPadOS 15.7.8 for older devices that can't run iOS 16, tvOS, WatchOS, and a flurry of updates for various flavors of MacOS.
Even with automatic iOS updates enabled, it can still take a few days for the update to be installed. My advice is to take charge of the process and manually install iOS 16.6. To do this, tap on Settings then General > Software Update. Then, tap Download and Install to kick off the update and keep your iPhone safe.