The phrase "until the finale" is correct and usable in written English.
You can use it to refer to the end of a series of events, such as a game or a performance. For example: "We cheered and clapped until the finale, when the team won the championship."
Until the finale, that is.
They're not on again until the finale.
And that doesn't come until the finale when those instantly identifiable characters crisscross.
And until the finale (which is a tad overdone), he rations his big, knock-'em-dead sequences.
It improves over time, but it's not really until the finale that "Luck" quickens its pace and builds suspense and a sense of urgency.
The two, like all contestants on the show, were asked not to discuss the outcome with anyone until the finale was broadcast.
Lambert's flamboyance conflicted with the show's notorious reluctance to field openly gay contestants: he seemed to be telling us he was gay without spelling it out (until after the finale), and the subsequent conversation in the media, and online, showed how far we had come.
As the writers turn against her, Valerie steps into trap after trap, until, by the finale, she's become so desperate to be liked that she stage-dives into humiliation, signing vomit bags for reality fans.
Mr. Tyranny will repeat his performance (as exactly as possible) at every concert, where another composer-performer will join him until, at the finale tomorrow evening, the ensemble will also include Jon Gibson and Roscoe Mitchell (both playing winds), Peter Zummo (trombone), Leroy Jenkins (violin) and Mark Dresser (bass).
I think, as penance, he should not wear another shirt until the finale-reunion show is over.
"The Twelve Days Of Christmas" is happily presented as a dance number so you needn't hear most of the lyrics until close to the finale.
