If you have productivity set in Reports -> Productivity, then a new Productivity timeline will show up on Personal, Day view. Productivity timeline shows productive time (green) and unproductive time (red). Neutral or un-assigned time is not displayed (white).
Personal productivity timeline
Administrators can also see productivity timeline for all users on the server. To see productivity timelines for all users, go to Reports -> Timelines and on the top right side choose to display Productivity timelines.
Productivity timelines for all users on the server