Sor’s À la bonne heure, six waltzes, op. 51, was first published in Paris in about 1832. For a discussion of the context of this work, see the notes to op. 48 in this edition. The title means “At last!”.
This edition comes from the new 2020 second edition of Sor’s New Complete Works for Guitar edited by Brian Jeffery. The Introduction and Index to the entire series can be seen here on this site.