Apple's Screen Time feature launched with iOS 12 as a tool to help track and limit time spent on specific apps or app genres, basically offering a way to help parents deal with excessive smartphone use by their children (and themselves). Catalina, the latest version of macOS now offers Screen Time as well, letting you track total time spent on an app whether it is on your Mac, iPhone or iPad. Your iPhone and Mac will both be set to share Screen Time data with your other devices, but you can turn that off if you want.
Now that macOS Catalina has been released, Apple reminds everyone to upgrade. If you have a System Preferences app icon in the dock on your Mac, it will show a red notification badge until the update is installed. This goes for any updates, including security updates to the current version of macOS on your Mac. Some users are reluctant to update to Catalina, because of significant changes to macOS.
With macOS Catalina, iTunes file sharing no longer exists, in fact iTunes is gone altogether. Instead, you can share and synch files with your iOS devices directly through Finder. Of course you can still use iCloud Drive and AirDrop for file sharing, and those options are probably what you will use most of the time since they are quicker and easier, but this option exists nonetheless. Here's how to do it on your Mac running macOS Catalina or later: