As an Administrator, to find what report is scheduled in Web TimeSheet, click on Reports and go to the Setup option on the left side pane. Click on Report Schedules to find the list of reports that you have scheduled in Web Timesheet.
If you would like to see all the reports that are scheduled in Web Timesheet (not just the one that you have scheduled), then you will need to run a report called, Report Schedule.
In case, you don't find Report Schedule report in your list of reports, you may add it by clicking on the Add Report link under Setup, give it a name and use the template named Report Schedule to create it.