Duuuh. Of course. This is just the preliminary autopsy. It takes time to get back the toxicology and other reports.
It also takes time for money transfers and getting the fix in.
The “private coroner” they hired was Michael Baden.
https://en.wikipedia.org/wiki/Michael_Baden
He was chairman of the House Select Committee on Assassinations’ Forensic Pathology Panel that investigated the assassination of John F. Kennedy. He also investigated the assassination of MLK.