"would wait until" is correct and usable in written English.
You can use it to introduce a specific point in time in the future. For example: "He said he would wait until Monday before making his decision."
Letters, catalogs and the rest would wait until Monday.
Reyes said he would wait until after the season.
He would wait until a less delicate moment.
We would wait until Tuesday before contemplating buying the shares".
Fassel said he would wait until Monday to decide.
But Mahmoud hobbled into the mosque; the answer would wait until after prayers.
Jeter said she would wait until Wednesday to consider how to approach the race.
If they failed, they decided, they would wait until the goose started molting.
Boucher said he would wait until Tuesday to consider the difficulty of his next job assignment.
Ms. De la Rosa's doctor said he would wait until Dec. 18 before inducing labor.
It remains unknown whether Disney would wait until after her pregnancy or find another actress.
