Is Nietzsche's Overman a Literal Being?

Lukasztitzner: Grombovitz stresses impossibility of the overman ever coming into existence purely due to the workings of danger. Do you think that Nietzsche's overman, the superior species, has even a chance of existing? "Nietzsche is saying that the overman has yet to be born and his philosophy," says Lukasztitzer. 'I don't think the overman is a literal being'