While not tax related, consider wear and tear on your vehicle and value of your time. $250 per week net would be good if only doing it 10-20 hours a week. Otherwise, consider something else, such as working part time somewhere. Many places pay around $15 per hour.

Another consideration is car insurance. Be sure to add a rideshare endorsement (even though you're not transporting anyone) or similar (may be called something different) to your insurance policy. Some companies offer it at a nominal cost. Others don't and insist on commercial coverage (overkill for small-time gig work). Many drivers overlook the insurance coverage aspect at their peril.