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À point (see other alternatives; depens on context)
Explanation: The best expression depends on context. For instance, it is true that "juste à temps" is used in Canada. This expression is also used when supplies are ordered on a as-needed basis. "À la bonne heure" can be more appropriate in some contexts, such as when a comment is made at the right moment. This expression, used by Alexandre Dumas (and others) is better in European French contexts. Of course, sometimes you can say something like "au moment opportun","au bon moment", or "à point" (such as in "cela arrive à point", which is my favourite expression).