How much longer before I start flushing

Any idea how much longer I should wait to start flushing? Sorry for all the newbie questions, really want to get this right. I've had to many failures due to bad timing.

Day 50 of flower, should be three weeks left but looks like it may be ready earlier, not sure. Growing in FF OF Soil and using Advance Nutes MGB and Perfect Grow Series.

Thanks,
GR
 

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