As soon as the respective agencies analysed it and get to it. This doesn't happen over night, but is a more complex process which will quite certainly happen.
GDPR violations aren't a crime. You can be fined multiple times for the same issue if you, for example, are being a complete ass towards the DPA or you refuse to fix underlying issues.
FB is being blocked by the Irish DPA, since EU FB is HQ'd there. Sadly this one loophole made it into the GDPR, so the other DPA's can only forward to the Irish agency for FB issues.
It's such a boring dystopia that the only response they have is "it's from 2019", like WTH?