Robertson, O. Palmer. The Books of Nahum, Habakkuk and Zephaniah. The New International Commentary on the Old Testament. Grand Rapids, MI: Wm. B. Eerdmans Publishing Co., 1990.
Robertson is theologically insightful throughout this commentary. He captures well the message of Zephaniah in its canonical context.
Motyer, J. Alec. “Zephaniah.” In The Minor Prophets: An Exegetical and Expository Commentary. Edited by Thomas Edward McComiskey. Grand Rapids, MI: Baker, 1998.
Motyer is also a sure-footed interpreter of this book. I found his treatment of the structure insightful. He also makes the connection between Zephaniah and 2 Peter.
Patterson, Richard D. Nahum, Habakkuk, Zephaniah. Wycliffe Exegetical Commentary. Chicago: Moody, 1991.
Patterson does a good job of handling the Hebrew text and the exegesis of specific passages.
Bailey, Waylon. “Zephaniah.” In Micah, Nahum, Habakkuk, Zephaniah. The New American Commentary. Nashville: Broadman & Holman Publishers, 1999.
Baily was helpful on the structure, and his comments throughout are helpful.
DeRouchie, Jason. “Zephaniah.” In Daniel–Malachi. ESV Expository Commentary. Wheaton, IL: Crossway, 2018.
DeRouchie is sensitive to Messianic and New Testament fulfillment of Zephaniah. He sometimes comes to the edge of over-realizing his eschatology, but he is nonetheless helpful.
Renz, Thomas. The Books of Nahum, Habakkuk, and Zephaniah. The New International Commentary on the Old Testament. Grand Rapids, MI: Eerdmans, 2021.
I was not able to read Renz beyond the section on structure. He was helpful on that score.