This is the 658th most frequent Serbian word.
успели
"Успели" means "succeeded" in English.
The word "успели" here means "managed," indicating success in attaining a goal.
Ми смо успели да завршимо пројекат на време.
We managed to complete the project on time.
The word "успели" is used as "did [you] manage," asking about an effort's success.
Да ли сте успели да нађете тај ресторан?
Did you manage to find that restaurant?
Here, "успео" (masculine form of "успели") means "succeeded," referring to achieving significant life goals.