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I don't keep up with jailbreaks, so whether there is currently one for 5.19.2 or not I don't know.
In general, jailbreaks rely on finding a bug in the firmware that allows unsigned code to run on the Kindle.
So it's always "a" jailbreak, not "the" jailbreak.
Timing is impossible to say. It depends on how much time people are willing to spend on it, and how easy is is to find an exploitable bug. Obviously the Amazon developers rather hope that it gets harder with each iteration of the firmware.
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