your luck is in
US /jʊər lʌk ɪz ɪn/
UK /jʊər lʌk ɪz ɪn/

1.
tu as de la chance, ta chance est là
used to say that someone is having good luck
:
•
You found a twenty-dollar bill on the street? Your luck is in!
Tu as trouvé un billet de vingt dollars dans la rue ? Tu as de la chance !
•
If you get the last piece of cake, then your luck is in.
Si tu as la dernière part de gâteau, alors tu as de la chance.