What is the authenticity of the Hadith which means: "Whoever has a seedling, let him plant it, and whoever is unable to plant it, let him plant it," and what is its chain of narration (isnad)?

The Prophetic Hadith: "If the Hour (of Resurrection) comes while one of you has a sapling in his hand and he is able to plant it before it comes, let him do so." This Hadith was narrated by Imam Ahmad from Anas and authenticated by Al-Haythami, Al-Arna’ut, and Al-Albani. Its meaning is that a Muslim should continue doing good deeds, such as planting, even if it is moments before the Hour begins, and he will be rewarded for that.