SDCC 2019 and DC Comics Universe Spoilers follows.
Batman: Three Jokers Timing?
From DC Comics’ SDCC 2019 panel Ask the Publishers.
DC Comics Co-Publishers Dan DiDio and Jim Lee:
Three Jokers
Lee: “There’s no reason to rush it.”
Didio: “They’re about 2 and a half Jokers in.”
So, it’ll probably get solicited once all three issues are in the can to avoid Doomsday Day Clock delays.