In an unforeseen turn of events, hacker Pwn20wnd released v3.5.0 of the unc0ver jailbreak tool to the general public Sunday morning with official support for iOS 12.4, the latest available firmware release from Apple with support for Apple Card.
Update: iOS 12.4.1 is now available as of Monday, August 26th, and this update patches the exploit for iOS 12.4
Pwn20wnd announced the update just a few minutes ago via Twitter: