First outdoor Autoflower Grow UK Update

Hi
This is my first auto grow outdoors in the uk and the strain is speed devil, it is now been 73 days
and the leaves at the top are starting to turn and most of the pistils are orange. some of the calyx's near the top have turned brown what does this mean is it bud rot.
but near the bottom there's still new growth and most pistils are still white.

When to harvest?

any advice would be much appreciated.

Cheers.
 

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