No offense Buddha, but it's better if it's a minimum of two days before, and two days after, if a bath is crucially needed at this point of time.
Bottom line
Learn how to apply Frontline properly, don't be stingy, establish a regular Frontline routine and follow the protocols, work hard in inspecting your dog twice a day for at least a week from sighting, clear away unnecessary fabrics and beddings like doggie beds, soft toys etc from any area your dog frequents for the time being, and keep a very sharp eye out for any signs of tick infestation in your home.
And no, it's unlikely any humans will get sick or die from being bitten by a tick here unless they are extremely unlucky, or have underlying pre-existing conditions that may be hyper-potentiated or exacerbated by secondary infections transmitted by tick bites.
I hope you have the other basics like heartworms covered because that's another real nasty one. The worms will kill the dog, and the treatment itself may also kill the dog.
All the best, may your dog be well, and may the ticks not make a nest in your home this Christmas.