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You will add all your self-employed income together and report them together in the same field.
When working for a food delivery company, you are considered self-employed because you are free to carry out the duties as you please since you are contracted independently, not hired as an employee. You report your self-employment income on the T2125 – Statement of Business or Professional Activities form. Here you will claim your gross income from the business, deduct any expenses to calculate the net business income, and report the GST/HST paid if applicable. The net business income is reported on Line 13500 of your Income Tax and Benefit Return.
Taxes will be applied to the net business income, not the gross amount. And since you are contracted by the carrier and not employed by them as a salaried employee, the carrier will not withhold taxes from your income on your behalf.