Allah's Messenger (ﷺ) al lowed the owner of 'Araya to sell the fruits on the trees by means of estimation.
Sahih al-Bukhari Book 34, Hadith 135
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Sahih al-Bukhari Book 34, Hadith 134 Next Hadith → The Prophet (ﷺ) forbade the selling of fruits unless they get ripe, and none of them should be sold except for Dinar or Dirham (i.e. money), except the 'Araya trees (the dates of which could be sold for dates).

Sahih al-Bukhari Book 34, Hadith 136