The "Timebar" indicates :
- time as a frame ruler and you click and drag within it to scrub your timeline.
- display the keyframes you have set, their activation state and the selected one (not in the Graphs Panel's Timebar).
Keyframes in the Timebar
During a keyframe drag and drop operation a tooltip indicator will be displayed with some time informations.
Right click over a keyframe or in upper part of the "Timebar" open the keyframe contextual menu giving access to the keyframes actions.