A prune is a plum dried for keeping, read as age, preserved goodness and the wisdom of later life. It can also point, with some humour, to wanting things to move along.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.