This is the 658th most frequent Serbian word.
успели
"Успели" means "succeeded" in English.
Here, "успео" (masculine form of "успели") means "succeeded," referring to achieving significant life goals.
Он је успео у животу и постигао своје снове.
He succeeded in life and achieved his dreams.
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.