I am not an official expert but at least I can say following based on my
knowledge and experience;
I this season measured the yield of the oil content by harvesting my
grove in three different times. First I harvested in late October, the
olives were totally green and I had green coloured 1kg oil out of 10kgs
olives {or 10% oil}. The second harvest took place in early december, the
colour of the olives were half green and I had 1kg green coloured oil out of
6,5kgs olive {15.4%}. And I yesterday picked the last bid and I had 1kg
slightly greenish oil from 5,6kg olive {17.9%}. The more the olives ripen
the more oil you get. Last season I had harvested in mid January and the oil
content was in its peak 1/4,5 or 22.2%} and the oil was yellowish. However I
am talking about my own olive grove meaning it usually depends on 1. the
olive variety 2. climate, rain and irrigation 3. desired oil quality.
It is obvious that early harvest olive oil is the superior quality but the
quantity is not that much. I would choose early harvest for my own
consumption.
Ozgur Akoglu
Aydin/Turkiye


{moderator note - Thanks for the explanation, hopefully it is much clearer
now. All the points you make are very relevant.}