is it possible to use JQL filter to:
1. find User Timesheets which does not have 40 hours entered yet for the week
2. to find which timesheets are not sent to approval
3. which timesheets are pending approval ?
there is no JQL for this, every worklog is connected to an issue and every timesheet is a collection of worklogs on different issues. You could use the excel export and create a pivot table to show you the information you are looking for but the easier way is probably to use the Team timesheet as I mentioned to you in https://answers.atlassian.com/questions/213270/tempo-timesheet-for-entire-organization/214531.
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