Harvesting time

Good day!
I am a first time grower and I think that my plant is at the end of the flowering stage. I have some pictures of the plant. Would some knowledgeable person advise me if it's ready or if I should start flushing.

Thank you very much in advance.

 

Thank you for your reply! would you start flushing the plant now or wait another week or so?

 

Here's some more pictures of the trichromes.
How do I know when the plant is ready to be flushed and harvested?
thank you in advance.