Yes egg whites are okay to eat raw or even drink raw.
So you can safely drink egg white as long as you have pasteurized egg whites.
I would not risk drinking non pasteurized egg whites from non pasteurized eggs because you risk developing salmonella poisoning.
But for pasteurized eggs the egg white is safe to drink.
It can also take some getting used to to be able to drink egg whites as it might make you want to gag at first.
I tried drinking egg whites and plain raw eggs before and I just couldn't get it down.
Some people can though and it's safe as long as the eggs and egg whites are pasteurized to prevent salmonella poisoning.