Hello! Something to consider is that after your case is shipped to the consulate/embassy, the times will vary according to the backlog and processing times there.
Something else to consider is that I NEVER would have expected for the NVC to take 3 months to receive and create cases. Pretty crazy! I also know it takes even more time for the case to be sent to the consulate/embassy, then more time for the interview to be scheduled, then more time for the actual interview.
Since my case will go to Mexico, and I believe there's a bit of backlog there, I'm assuming it can take 3 months to receive a scheduled interview after being on Ready. I'm hoping that I'll have my visa by November, but even then, I can't exactly predict when and it could end up being January.