System jobs run periodically. They look for new updates and create a hardware and software inventory. In the Update Center you can see the data that has been found with the system jobs. Under system jobs are tabs that can be viewed. The first is there to be able to see whether a system job has failed.
In "Jobs with Hardware" you first have to select the relevant device in order to be able to view the system job.
The hardware must therefore be selected, as it is possible that there are more than 1000 devices, so it would be unwise to display these together in a list if one were to search for a specific device.
Under Settings, you can set the time when a system job should take place and how much time should lie between the system jobs and the Wuinstall Source.