How long does it usually take for the reports to be announced for an incident like this?
Depends on the magnitude of the incident. (fatalities, injuries, cost to repair and public interest)
If there is a mechanical or systems fault, that all other operators need to know, then within weeks.
If its a CRM issue and or training, then it depends on the investigators workload to create a public report (mostly long after the public has forgotten about it.
as a PPruner, if this thread doesn't reveal the answer via leaks within a month, then you really don't need to know
meanwhile the "could ofs/ should ofs" among us will have a field day of posts to extend the thread life