Genèse 40:10

And in the vine were three branches; and as it sprouted it brought forth buds, and immediately they ripened into clusters, and became grapes.

AND IT WAS AS THOUGH IT BUDDED AND ITS BLOSSOM WENT UP. “It seemed as though it budded. And it was as though it budded, i.e., it seemed to me in my dream as though it budded, and after the bud its blossom shot up, and after that it brought forth the clusters and then the ripe grapes. Onkelos translates: ‘And, when it buddeth, it brought forth sprouts.’ These words are the translation of the word porachath alone.”. Rashi’s intent, in quoting the Targum, is to say that Onkelos’ words, apeikath lavlevin (brought forth sprouts), is an expression which Onkelos appended to his translation of the Hebrew word porachath. Ramban will later differ with this opinion, holding that it constitutes Onkelos’ rendition of the Hebrew word althah, and signifies: “And it, when it budded, immediately brought forth sprouts.” See below, Note 271. Thus far the words of Rashi.
This is not correct. If he is speaking in terms of appearances because they are matters of a dream, he should say, “Behold, like a vine was before me, and on the vine like three shoots.” This kaph of comparison is found neither in the dream of the chief of the bakers nor in the dream of Pharaoh. Why then should the chief of butlers use the comparative form more than the others? Instead, in all three dreams it says v’hinei (and behold). is used in connection with Pharaoh’s dream. It is this word which indicates comparison, for its meaning is “as if.”
But the explanation of the verse before us, And it was ‘keporachath’ its blossoms shot up, is that he saw that immediately as it budded, its blossoms shot up and its clusters ripened into grapes. This was to indicate that G-d was hastening to do it. This is how Joseph recognized that the “three shoots” indicated three days, and not months or years, and he himself deduced that on the same day the two will be summoned before the king. It may be [that this was also indicated by the dreams] because both of them dreamed in one night. Thus there is no need for the words of Rabbi Abraham ibn Ezra, who says that Joseph knew of Pharaoh’s birthday.
This usage of a kaph to indicate immediacy is found in many places: And it came to pass, ‘k’meishiv’ (as he drew back) his hand; ‘k’vo Avram’ (as Abram came);, 12:14. ‘uk’eith’ (and at the time) of her death the women that stood by her said, and many others.
Onkelos’ rendition into Aramaic stating, …

כפורחת עלתה נצה, this was the customary sequence of a fruit’s development. Compare Numbers 17,23ויוצא פרח ויצץ ציץ ויגמול שקדים, “it brought forth a blossom, sprouted a bud, and almonds ripened.”

שלשה שריגים, branches of the grape vine are known as שריגים.

והיא כפורחת, at the time when the vine was in bloom it produced leaves at the same time.

עלתה נצה, the unripe grapes suddenly ripened until they were fully matured fruit. The fruit of the grape vine is not called ענבים until it has fully matured. We have already discussed the meaning of the preposition כ in the word כפרחת in 38,29.