Electronic Arts have confirmed that we shouldn't expect Battle Royale to be released until March 2019. So, if you were hoping that you will get your hands on it soon enough, that ain't happening.
Some people thought that we may see it sooner as Call of Duty: Black Ops 4 is coming with a Battle Royale by default, but it's not happening sadly.
Criterion Games is the studio that decides on things like these, so their word has to be followed.
Battlefield V will launch on November 20 on PC, PS4, and Xbox One. While waiting for the release, you can replay Battlefield 1 just to...you know, get a good grasp of your weapons again.