came on the scene

[keannu]

The writer is thanking the man who helped the writer a lot. Is "come on the scene" a common expression?
When is it used for? It must be different from merely "you appeared".

ex) I feel a little overwhelmed now by all the “new” in my life. New job. New apartment. New neighborhood. But the best “new” is a new perspective. I don’t have to tell you how desperate I was feeling. When things started to go from bad to worse, I almost felt numb. That is, until you came on the scene. I just can’t thank you enough for all the time you’ve spent with me. Calling everyone in your network to help me locate a new job here. Coaching me on the interview. The hours you’ve spent on my behalf seem like an incredible gift. Your love and concern feel like a warm blanket on those long nights as I adjust to my new life.

[billmcd]

The writer is thanking the man who helped the writer a lot. Is "come on the scene" a common expression?
When is it used for? It must be different from merely "you appeared".

ex) I feel a little overwhelmed now by all the “new” in my life. New job. New apartment. New neighborhood. But the best “new” is a new perspective. I don’t have to tell you how desperate I was feeling. When things started to go from bad to worse, I almost felt numb. That is, until you came on the scene. I just can’t thank you enough for all the time you’ve spent with me. Calling everyone in your network to help me locate a new job here. Coaching me on the interview. The hours you’ve spent on my behalf seem like an incredible gift. Your love and concern feel like a warm blanket on those long nights as I adjust to my new life.

Use of "came on the scene" is not uncommon. "Arrived" or "appeared" or in your example, "came into my life".