Summary:
For the approver to see the task progress bar in the user’s timesheet which is waiting for his approval, you need to enable Show task progress in timesheets awaiting approval  option in the approval settings in his permissions. 
Resolution:
To enable Show task progress in timesheets awaiting approval option in the approver’s permission

  • Click on the Administration icon in the top menu.
  • Click on Users in the side menu, it will list the Users.
  • Click on the edit icon beside the Approver name to check the Permissions assigned to him.
  • Click on Permissions at the side menu under Users/Departments.
  • Edit the Permission assigned to the Approver.
  • Enable Show task progress in timesheets awaiting approval under Approvals settings in his permissions.
  • Click on Save button.
  • Log off and Log back in to Web TimeSheet.