imho the best thing to do is to vacuum out the reservoir, which theoretically would remove all the oil. But then I'd take it to the dealer to have the coolant replaced since they have an evacuation machine. Or, maybe not the dealer, because who knows if down the line there is a comment that causes a warranty denial. Anyone who has the machine can get it out.
Like others have said, not the end of the world, and we're all dumba**es in some way, shape, or form, at some time! Just don't drive it to prevent the oil from circulating.
Wonder which is denser, oil or coolant? If oil is less dense, even better! good luck.