Based on past major release roll-outs, it's more likely that once V9 starts being distributed, it will take weeks to months before owners see it in their cars, following what will appear to be a seemingly random sequence for distributing the update.
And, unless Tesla has made improvements in their software development and testing process, we're likely to see major issues encountered during the early installs - causing the process to pause while they fix those issues before resuming the process.
One of the features Musk promised months ago was the ability for owners to request an update be installed in their car - if/when we get this feature, then owners would have a little more control over when they would see the software update, and could (theoretically) request the update be sent to the car quickly after it first starts getting distributed. Will we see this as part of V9?