Critical Updates.app keeps you informed of when a background update of the listed components occurs. These are controlled by the command line softwareupdate tool and by App Store preference settings in System Preferences.
Critical Updates refreshes the Components table on launch, and about once every 60 minutes if left running; it polls the App Store for Security updates on launch and about once every 10 seconds while running. Critical Updates has a very low energy and resource footprint and can be left running with virtually no impact on system resources.
Versions Critical Updates for Mac
1.59 : Feb 28.2018
Screenshots Critical Updates for Mac