It appears to be a big day for the Electra Team. Just this morning, the iOS 12-centric Chimera jailbreak received an update to version 1.2.3 with support for certain builds of the iOS 12.3 beta, and in addition to that, the tvOS-centric ChimeraTV jailbreak was updated to version 1.2.2 with support for tvOS 12.2 on the Apple TV 4K.
The Electra team shared both announcements this morning via Twitter, linking to the newly-updated jailbreak tools on the Chimera website in the process: