With pre-load fixed for November 12 and launch fixed for November 19, the open question for most players is the clock. Rockstar has not published an unlock time. What exists is store-listing data: PlayStation Store countdowns per country, matched by Xbox Store listings in the countries independent trackers have checked.
Those listings follow one pattern. The game unlocks at midnight local time in each region rather than at a single global moment. New Zealand goes first at 00:00 on Thursday November 19, which is 11:00 UTC on Wednesday November 18. Australia, Japan and South Korea follow through the Wednesday afternoon in UTC terms. Continental Europe unlocks at 23:00 UTC on Wednesday, the UK and Portugal at 00:00 UTC, Brazil and Argentina at 03:00 UTC, the US East Coast at 05:00 UTC and Mexico City at 06:00 UTC.
Leonida Intel context
Store countdowns have been accurate for recent Rockstar and Sony launches, but they can move. Plan around your regional midnight and check the store page again on November 18.
The practical consequence is that US West Coast players see the game unlock at 21:00 on Wednesday November 18 local time, because the US listing uses Eastern midnight. Perth is similar, unlocking at 21:00 local because the Australian listing uses Sydney midnight.
The Leonida Intel release-time page converts the full table into your own time zone and counts down to your regional unlock. It is labelled as store-listing data, not a Rockstar statement, and it will switch to the official time the moment Rockstar publishes one.