From the BCAWA website...." Do not use it in any wine that has undergone MLF; if the MLF recurs, the resultant unpleasant odour will be geraniol, a geranium-like smell."
You can run the risk of testing to make sure MLF is done, add your p-metabisulphite, and then sweeten and sorbate but if testing/additions are incorrect MLF can start up again.
After MLF is done you can add metabisulphite ( sterile filtered with an addition of SO2. So far, I have not had any renewed malolactic fermentation.)...again from BCAWA article