Due to an error on the part of Apple, jailbreak has recently become available for the latest public version of iOS. Tools
Earlier this week, the Unc0ver tool had partial support for A12 / X devices, but this is not enough, because it is still impossible to install tweaks on these devices.
However, this may change soon, and we can get a full iOS 12.4 jailbreak for iPhone XS, iPhone XR and iPad Pro 2018. The team is working hard to achieve this.
The development team does not work on PAC bypassdue to the high level of difficulty. Instead, they are working on an alternative way to jailbreak A12 / X Bionic devices with iOS 12.4. You should not rejoice early, because there is still a lot of work to be done so that you can install jailbreak tweaks.
It is not known when the full iOS 12.4 jailbreak for A12 / X Bionic devices will be released, but now we at least know that the team is working on it.