That's pretty good training Liquid Scope. When I did it, the assistant manager rode with me on the first delivery before he deemed me ready to go solo. However, I was 23 at the time and already gone through several years of mental correction to mature and hone the work ethic. The manager probably realized that when he decided I was good to go without any further training. They did spend a bit more time with some other younger drivers.
When I look back on those days, I realize that I still had a ways to go on my journey of mental correction at 23. Of course, I didn't think I did at the time. Now I know for certain that the journey never ends.