No, single cell life forms have had the longest time to evolve, but there are still single cell life forms because they continue to survive, even as they mutate into other single cell life forms. Some of the single cell life forms evolved -- through many steps -- into sea animals. And so on.
Evolution isn't goal-oriented, except for the abstract goal of survival for generation after generation. The long sequence of mutations that finally resulted in human beings -- after millions and millions of generations -- had the fortuitous result of generating intelligence that could participate in a forum like this. It could have turned out many other ways. For example, if an asteroid hadn't landed in the Gulf of Mexico 65 million years ago, dinosaurs might still be dominant over whatever our little furry ancestors would have evolved into.