Herkese merhaba! 

I would need help with the translation of the following expression: kedi olalı bir fare yakalamış / tutmuş. I can´t really provide a good context, it came up in a conversation that was about people who usually don´t do anything productive, except for a few scarce exceptions. 

Yardımınız için şimdiden çok teşekkür ederim!!

İyi günler! 

He caught his first mouse since he had been a cat. 

This is a saying. It means "He achieved something important or good at last".