Why would that be the case? The jury must be present in the court room for the reading of the verdict, which will be live or at least reported live via social media. Several hours’ notice does no good unless it’s specifically to plan the details of whisking the jurors out of the court room to safety under cover.
I’ve been involved in a couple tense murder trials and there is an announcement of a verdict, then some time is allotted to get the principals back to the courthouse as well as organize security.
In one case, there were 20 deputies in the courtroom just to keep the various families separated during the reading of the verdict. This case will need far more than that, especially outside the courthouse.
Don't they have to face the accused in person? Wouldn't George also be whisked away if safety for anyone is a concern. Several hours does make it look like something happens in the meantime. Unless it's to give the verdict to WH/holder first.