I agree with the others that said that Sisko's body is gone. Otherwise how would he be able to 'physically' interact with the disembodied Sarah-prophet as well as the transcendental Kasidy.
That said, I don't think it's out of the realm of possibility for the Prophets to retrieve Sisko's body from the moment it disintegrated in the Fire Caves, restore it with his disembodied form in the Temple and send it to a future point in the timeline. Especially given the fact that Sisko promised his return.
That said, I don't think it's out of the realm of possibility for the Prophets to retrieve Sisko's body from the moment it disintegrated in the Fire Caves, restore it with his disembodied form in the Temple and send it to a future point in the timeline. Especially given the fact that Sisko promised his return.