My experience is that the FP machines are not on when you first get to EMH. However about 15 minutes before the park "Officially " opens, theFP machines are in use. It does seem that they do not all "go up" at once though. So get a couple of quick rides in, and keep an eye out too!!
I know when I did morning EMH at Epcot they all were, same went for evening EMH, well, you had to get the FPs before park closing as they were sold out, but the return times were for during EMH times.
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