ChronyControl is primarily a front end to the chronyc tool delivered with the chrony software. It can show the overall server performance (tracking) and the state of individual remote time servers
ChronyControl bundles the most recent version of chrony (chronyc and chronyd) and, via the Settings button, can configure and install chronyd.
The upper clock displays the current time of your Mac. The centre hub of the clock will be red if chronyd is not running, orange if the daemon is running but is in an unsynchronised state, and green when chronyd is synchronised and disciplining the system clock.
The chronyc popup button enables you choose between the tracking, sources and sourcestats chronyc commands.