an encroaching darkness bringing pain and despair

I'm not interested in moving up right away, and from what I've read around here, GSA doesn't make anything more money-wise than a regular cashier. However, I was wondering what the general timeline is to move into this position if I were to show interest, and if such a position is even open...

My store's taking the first double in years, since several years before I started working there. I'm not looking forward to it, but I'm kind of interested in seeing how we deal with it. We never push a truck during open hours, so this'll be different. We typically have a 4am start time, 3am...