Go to the manufacturing order ==> enable the manage timesheet and project per mo check boxes.
You can see the timesheet tab and the timesheet smart button in the manufacturing order form.

By clicking on the timesheet smart button, it will open the timesheet list view.

To view the work orders timesheet, click on the work order smart button from the manufacturing form.

By clicking on the work orders smart button, it will open the work order list view.
To see the timesheet click on the work order line from the list view.

By clicking on the work order line from the list view, it will open the work order form view.
In the form view, you can see the timesheet tab and the timesheet smart button.

By clicking on the timesheet smart button from the work order form, you can see the timesheet of the individual work order.

Select the timesheet menu from manufacturing and select my timesheet, you can see individual user timesheets.

You can see the timesheets grouped by manufacturing order and work order.