Ole Miss received the NCAA's Notice of Allegations in late January, but has not made the document public. NCAA rules normally give the school 90 days to respond, which would put the deadline in late April, but an extension can be granted if anyone involved in the investigation asks for one.
I don't know that the 30-day extension applied to all parties. Bjork said back in April that a third party had requested the extension, and that UMiss would release its response once that 30 day extension had expired. We all assumed that meant UMiss would not respond until May 22, but now it looks like they were just refusing to release their response to the public until the 30 days was up.
Bjork's original quotes
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