http://www.ios9cydia.com/ios-9-jailbreak.html
It is true. IOS 9 is untethered JB capable, but i would wait till a bullet proof JB is available.
A jailbreak for iOS 12.4 beta complete with Cydia has been achieved on iPhone. Here are the details on it.
PsychoTea – who is relatively well-known to the jailbreak community – has seemingly become the first individual to successfully jailbreak iOS 12.4 beta and show Cydia running on the platform. The hacker and developer announced this achievement over Twitter.