Getting cortozone shot in my neck next tuesday an then the following tuesday I do custiodial :maintenance for work how long am I gonna need to be out?

Neck Injection. I would defer to the physician doing your injection for this recommendation. Depending on where the injection is done, what medication is injected, and what you pre- and post-injection symptoms are like will most likely determine what is recommended.
Few hours rest after. At the most a day after the injection. You should be able to resume work (full duty) the very next day.