What could be the damage caused to a person who had brain stroke?

Sorry for the heavy question perhaps. My dad got this morning stroke and was hospitalized in serious condition in intensive care. He had surgery, took blood shark. I Do not know what the extent of the brain but it’s on the left. Now he is unconscious for 48 hours and only after that they will try to wake him.

Why should I expect? What might happen to him next? I’m worried and afraid for his life :-(