First time grower - When should I harvest my auto royal bluematic?

Hola dear growers!

I am growing for the first auto flowering Royal BlueMatic (and North Thunderfuck).
I have been quite lucky, I have healty plants and everything looks really good (yield is a bit small though).
My problem is that I am not sure if I should harvest already or not, and I don’t want to spoil the first haverst I’ve been waiting for so looong!

The plant is looking the same since the past 2 weeks, tricomes look the same and not many pistils are turning brown (while the North Thunderfuck, 10 days younger, had ~50% brown pistils)

Can, some of you with more experience, give me a little help/suggestion?
Thanks! Below all the specs from my grow setup and tricome pictures!

Grow info
Region = Europe, seeds from RQS
Planted = 21-May-23, sprouted within 3 days, 73 days old. Dunno when it started flowering
Medium = home made soil → 6.7 Ph base soil enriched with bananas, coffie, eggs shell, warm compost and micro nutrients (epsom salt, etc)
Nutes = Very small nutrients
Lights = 52 days with 600W HPS (was too hot and power hungry), 21 days 200W LEDs 292 Samsung LM281B (used only without IR, veg mode)
Temps = 77F to 90F with HPS, 72 to 77 with LEDs
Grow box = 0.8x0.8x2 meters, kept always wide open
Fans = 1 big one outside box + the one for exaust out with HPS, smaller one inside + exaust with LEDs
Royal bluematic full plant

Royal bluematic main branch

Royal bluematic tricom 10X

Royal bluematic tricom 10X

Royal bluematic tricom 10X

Royal bluematic tricom 10X

North Thunderfuck full plant (10 days younger)

North Thunderfuck main branch (10 days younger)

North Thunderfuck tricoms 10X (10 days younger)

North Thunderfuck tricoms 10X (10 days younger)

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Welcome to the community , Both plants could use more time to finish up.
(Couple weeks) Happy growing

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Couple weeks to go. The thunderfxxx looks a little closer, but they both need time.

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