Un ouvrier de la onzième heure

Literally: A worker of the eleventh hour

Example: “Il n'a rejoint le projet qu'une semaine avant la fin, en ouvrier de la onzième heure, mais il a eu la même prime.” — He only joined the project a week before the end, a real Johnny-come-lately, but he got the same bonus.

English equivalent: A Johnny-come-lately

Origin: From the parable of the vineyard in Matthew, where laborers hired an hour before dusk are paid the same as those who worked all day. The parable defends the practice; the phrase generally does not.