Like it says on the tin.
Assuming that today, press around the world was forced to admit that Superman actually existed, and he will, from tomorrow onwards, operate in an overt and public capacity(where he previously took great pains to conceal his activities...)
In other words, Superman will now be able to address high-profile crimes such as terrorism, natural disasters, etc. where he once had to let some of theese go in case the public would know he existed.
Can humanity as it exists today handle the reality of Superman?
*For this scenario, Superman will be the only superhuman in existence, so no Cult of Wonder Woman's Posterior, or Temple of Darkseid's Stairs will be born...