problem, My tank is Fully cycled with fish, coral, SPS, and inverts. im just switching rock
Then there is really nothing to worry about. Adding clean dry rock to a fully cycled existing tank is not going to hurt your inhabitants and should not spike any nutrient levels. The dry rock may get "uglies" as it matures, bit it is not going to mean your tank recycles or anything like that.
The only exception i can think of is if you are adding rock with a lot of dead/dying organic material which wont "cycle" your existing tank but could spike your nutrient levels. If it is clean rock(cycled or not) it wont do that though.
The other possible result is if the rock has a lot of bound phosphate it could release in your existing tank, but this is not really relevant to a cycle...just something to be aware of and possibly test for.
*Edit: the above assumes you are adding the rock to an existing tank not replacing the existing rock. If you take out all the current rock and put the new rock in then you do want to make sure it is cycled first(and it sounds like yours is in any case)