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If your goal is to cure the rock and reduce the chance of a cycle in your tank then you want it in salt water with a heater and powerhead. Do a search for how to cycle live rock because in essence that's all you are doing. The soaking with allow all the organics to decay releasing ammonia and the bacteria process will begin. When it's done (based on water readings not duration) then putting the rock immediately in your display should not cause a cycle (or not one of any consequence anyway).
If it was me, I'd powerwash it just to get whatever may have gotten on itwhile laying out in the open then cycle it in saltwater... then plop into the display.
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