your luck is in

US /jʊər lʌk ɪz ɪn/
UK /jʊər lʌk ɪz ɪn/
"your luck is in" picture
1.

運がいい, 運が向いている

used to say that someone is having good luck

:
You found a twenty-dollar bill on the street? Your luck is in!
道で20ドル札を見つけたの?運がいいね
If you get the last piece of cake, then your luck is in.
最後のケーキが手に入ったら、運がいいね