Yes, TurboTax allows for situations where you have both T4 slips and self-employed income.

That said, if you received a T4 from Skip the Dishes because you are considered an employee, and you wish to deduct motor vehicle expenses, you need to enter these expenses on a T777 Statement of Employment Expenses.

For the self-employment reporting, you need to report if on a business form (e.g. T2125).