‘And the head cupbearer told his dream to Joseph, and said to him, “In my dream, behold, a vine was in front of me, and in the vine were three branches, and it was as though it budded and its blossoms shot forth, and its clusters brought forth ripe grapes. And Pharaoh's cup was in my hand, and I took the grapes and pressed them into Pharaoh's cup, and I gave the cup into Pharaoh's hand.”
Thus in his dream the cupbearer saw a vine which magically budded and came to full fruitfulness in a short time from which he was able to fill Pharaoh's cup (the wine magically fermenting) and give it to Pharaoh. The cupbearer probably went into more detail when speaking to Joseph but the writer is summarising the essential parts.