Yeah, you're right. It seems like most people experience slowness during the morning. But I think it's an awesome idea to run it in the background while going to the gym or running errands.
I like to run the apps when I am out doing errands or if I need to travel to another market. Sometimes I will deliver to customers if they are far away but only if the customer's destination is nearby my destination. I took a $15 order but the person only tipped $1. It was so high because it was over 10 miles away. I only took it because the store I needed to go to was nearby the customer's house. It may have been a low tip but I essentially got paid to drive for my errands.