It usually takes some days, perhaps a week or two.
Joe, are you asking because you are reluctant to get them directly from Oracle, and prefer only to use them as offered by Adobe on that page? I have seen some contend that. Maybe you have read that.
I have contended to the contraray that there's no NEED to wait for them to put it there, if you want to move to the new JVM sooner. [Update: see a response from Rakshith, the CF Product Manager, on why he still recommends people still download the JVM from Adobe rather than Oracle. I leave the rest here for the sake of context and background. Here's a link to his comment below, and I have a reply after that.]
You can go to the Oracle site, and logging in with a free account, you can download it from there. Yes, you will see there a warning that you must license Java to use it for production, but we CF folks are covered for that, according to this Jan 2019 blog post from Adobe.
To those who feel that only downloaders offered by Adobe on that CF downloads page would cover them, I will repeat (as I've said elsewhere here) that I have compared the installers there with what's at the Oracle site, and they are binary the same.
And since the installer includes as a first step your agreement to the license, it's clearly the same license, since it's the same installer. So no, it should NOT matter WHERE we get the installers. (I realize some may still be reluctant to get an account from Oracle and download from there. Such folks can then of course await Adobe putting the files on their site.)
Finally, no, "I am not a lawyer", and yes I am stating here my opinion. I welcome anyone to offer a refutation, whether technical or a technicality. To be clear, I've never seen where Adobe has said that we MUST download them from them, to be covered. Instead, it seems to be a mere assertion some have made or an inference they have drawn, and I would argue against each.
Joe, if none of that was your concern, sorry. Since this is a public forum, and others will generally come along later to offer thoughts, I try to address more than just the direct question asked. 🙂