You could probably let that go for another 2-3 weeks by the looks of it (if conditions stay good), though it is a bit difficult to say, depends on preference, etc.
Looks good though, still very green (which I often believe to be a sign of health, as purpling plants often have issues), mine is darkening quite a bit now (going into summer) and almost done too, but younger than yours. I'm wondering if I do a staggered harvest if I could reveg it to an extent, coz mine is tiny and conditions are very good for vegging now.
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