Not quite, Kmeta and sorbate will not stop an active fermentation. First the live yeast must be removed from the cider, ideally by filtration, but most homebrewers don't have a filter you can cold-crash the whole batch and rack off the lees, then repeat as needed. Once the cider stops throwing lees you can add the Kmeta and sorbate and keep the batch cold for another 24-48 hrs before backsweetening or bottling.
In all the states no door stands wider,
To ask you in to drink hard cider