Salaah with jamaat for 40 days;late coming

Till what time the takbir oola is valid. Like if one comes a little late and saw that takbir oola is being said but he is making his wuzu at that time and then after that he joins jamaat but by the time the imam starts Allhamdullah…………….. So does this mean that the person attented namaz with takbir oola or will he just only get the sawab of jamat and not takbir oola.