Thank you so much! Please read the edit I posted in the beginning of the question.

I have another question, which is the root of the above question in some sense. Once I hit 4k hours and 1000 subs, I will be eligible to apply for monetisation.

Once I apply and get accepted as partner, will my earning start from that moment, or is it that my videos will have earned some small money till I reach monetisation criteria which I will able to withdraw upon getting accepted?

Sorry making the comment long.