The Prophet (ﷺ) permitted selling the dates of the 'Araya for ready dates by estimating the amount of the former (as they are still on the trees).
Sahih al-Bukhari Book 42, Hadith 28
← Previous Hadith Narrated 'Abdullah (ra) said, I heard the Messenger of Allah (ﷺ) say "If somebody buys date-palms after they have been pollinated, the fruits will belong to the seller unless the buyer stipulates the contrary. If somebody buys a slave having some property, the property will belong to the seller unless the buyer stipulate that it should belong to him."

Sahih al-Bukhari Book 42, Hadith 27 Next Hadith → The Prophet (ﷺ) forbade the sales called Al-Mukhabara, Al-Muhaqala and Al-Muzabana and the selling of fruits till they are free from blights. He forbade the selling of the fruits except for money, except the 'Araya.

Sahih al-Bukhari Book 42, Hadith 29