I am a law school graduate. What I offer is mere information, not to be construed as forming an attorney client relationship.
Check your state labor code by following the link I have given below, but if you are salaried, it means you are EXEMPT from filling out a timesheet.
However, if your company pays you for overtime even if you are salaried, than I would imagine you would want to show how many hours you worked overtime to get paid for it.
Otherwise, click below, find your state and check either the LABOR CODE or the EMPLOYER AND EMPLOYEE CODE. Hope this helps.
https://law.freeadvice.com/resources/statecodes.htm