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As far as when you finish double wrap in heavy duty foil and put it in a cooler with towels until you are ready to slice it. It will be blazing hot for hours like that
Wait for it to probe tender*, let it cool until the internal drops 8°, then wrap and hold in an insulated cooler using wadded up newspaper or some towels for insulation. Check it after 3 or 4 hours just in case you need to move it back into the oven to raise the internal temp. Ideally you want it to be above 150° while in the cooler.
*probing is more accurate than the internal temp. Room temperature peanut butter is the feel you are looking for.