In the inbox of the universal worklist go to the Tracking tab.

All tasks by the tracked-by users are displayed. The numbers in brackets to the right of the category titles represent the ratio of the number of new items (x) relative to the total number of new items and those in progress.

Select the task you want to track, to display details on the task/request.

With the default filters, you can, for example, display the uncompleted tasks only or the completed tasks only.