Is the zakat on the olive harvest to be paid before or after its division, knowing that after division it will not reach the zakat threshold?

Zakat on olives becomes obligatory upon the appearance of their ripeness. If the olives left by the grandfather before his death showed signs of ripeness, then zakat on them is obligatory before their division. However, if their ripeness appeared after his death, then zakat on them is obligatory upon the heirs, each according to their share, provided it reaches the minimum threshold (nisab). The preponderant opinion is that zakat is obligatory on olives because they are a staple food.