That's one big ass plant that should be an impressive yield. I would 100% get a machine to trim that much bud lol.
Like others have said below the plant will start to enter its flowering stage when the lighting changes also know as a photoperiod.
The light is affecting plant hormones when it is on longer then 13 hours a day, When it stays darker for longer then 12 hrs a day that helps the flowering hormones build up and start the process.
It should be soon though as it will happen aorund the between the Summer solistace & Autumn Equinox.
Good Luck!
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