I have seen sellers run short payrolls through the date of termination/closing if they want to allow deferrals for as long as possible. I have also seen some process deferrals out of the first post-closing paycheck but only for compensation earned through the date of termination/closing.
Alternatively, if you intend not to take deferrals from the final (11/30) paycheck, you can (could have?) terminate the plan on 10/31 if you're confident enough the closing will occur.