The Electra Team released an updated version of the Chimera jailbreak tool for iOS 12.0-12.1.2 just this morning with significant speed improvements regarding the jailbreak process (the point where the tool exploits your device); but the fun isn’t stopping there.
Shortly after releasing the latest version of Chimera, the CoolStar-led Sileo Team launched an updated iteration of the Sileo Package manager with bug fixes and improvements.