You got a bad problem cause they are very obviously hunting in a pack. A single yote isn't much of a problem for any deer but a pack is another story.
My guess is start hunting them this winter but right now they will cause your deer to move if they are out chasing the deer. My bet is they are. I'd walk the property to see if you can see any kills they made recently. I'd also take a yote call to the stand just in case you see one out during the day to bring in to range.