It depends. Most owner operators are independent and enter their earnings and expenses on Schedule C. Here is an FAQ that will assist you to find this in TurboTax (You will be asked to upgrade to TurboTax Self-Employed to do these taxes): https://ttlc.intuit.com/replies/4801198
Per diem is entered under meals ($59/day from Jan. 1-Sep. 30, and $63/day from Oct. 1-Dec. 31), and you will check the DOT box as well. Here's an FAQ with more information: https://ttlc.intuit.com/replies/4146014
Any expenses related to your rig will be entered in the Business Vehicle Expense section. This will include depreciation, maintenance, fuel, tires, washes, truck insurance, tolls, and so forth. Here is a screenshot of what to look for in the expense section:
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