Check for Missing Employee Timesheets

Timesheet submissions and approvals from employees (we have 90+) and supervisors is often late and sporadic. I would like a dropdown option alongside "Not Submitted," "Submitted," "Approved", etc, to show employees who have no timesheet entries at all for that period. I spot-check everyone's timesheet by looking through these options, but that only works for they've put something on their timesheet. Otherwise, I have to use process of elimination to figure out who's not in yet. If there was an option to generate a list of employees who have not made any entries yet, it would save a lot of time and energy.