Does Wicked: For Good have a post-credit scene?

No. Wicked: For Good has no mid-credits scene, no post-credits scene, and nothing hidden at the end of the roll. When the credits start you are free to go, and Universal has never suggested otherwise.

The reasoning is structural rather than stingy. Jon M. Chu split one stage musical across two films and has been explicit that he wanted the story finished inside them — no third instalment, no dangling hook. The closing sequence is built to shut a door: Glinda alone above the crowd, the ambiguity around Elphaba's fate preserved exactly as the stage show preserves it, and a deliberate refusal to show the audience more than the characters are allowed to know. A stinger would have to either confirm something the ending is choosing not to confirm, or gesture at a sequel that does not exist. Part One carried no credits scene either, so the pattern was set a year earlier.

What does play is worth naming, because it is the nearest thing to a bonus track. "A Wicked Good Finale," a new John Powell and Stephen Schwartz piece featuring Cynthia Erivo and Ariana Grande, bridges the last image of the film into the opening of the end titles — the credits begin before the music has finished, which is why the room tends not to move. Behind it comes the "Wicked: For Good Suite," Powell's orchestral-and-choral run at the material one final time: "As Long As You're Mine," "Defying Gravity," "For Good," and the "Unlimited" motif that has been threaded through both films since the Part One overture.

If you have been tracking the score's buried references — the "No Place Like Home" melody hidden in that overture a year before the song existed, the single missing note in the Scarecrow's quotation of "If I Only Had a Brain" — the suite is where those threads are gathered and paid off. That is the reason to stay in your seat. There is simply no scene at the end of it.