When TurboTax software 2020 is available you can enter the deductions regarding the mileage used for business use of the vehicle.

You will need to keep track of all your KM's you used for both work and personal and then enter the KMs used specifically for each. 

Thank you for the information. I am still uncertain if the mileage on my vehicle before ubereats is useful or not. I am keeping track of the mileage for personal and business use once I started driving for ubereats. Thank you for your help.

CRA will want to know how much mileage you had on your vehicle for the year. Then you would divide it for the time you used it for personal and work. That will be the same if you are claiming what you paid for gas (Only the amount used for work is claimable).