Timesheets are split into 3 sections: Outstanding, Submitted, Approved.
Timesheets that need your attention will be in listed in the outstanding tab. This includes new timesheets as well as timesheets that have been rejected and are waiting for your correction and re-submittal.
The Submitted timesheets tab shows timesheets that you've submitted, and are awaiting approval from your supervisor.
Approved timesheets are listed in the Approved tab.