When confirming your task you are presented three options for scheduling: Instant, Delayed, and Schedule Cron-style. It sounds like you want the last option.
@Sebastian-Roth Hello, yes I have setup 3 servers with fog running and I was successful in capturing the image and deploying it to 18 computers at the same time. I did look at FOG API, but I had questions about it like does is it run on bash or other script but later figure that it runs on bash.