The cloiture vote was already taken...
Most bills have multiple steps where cloture could be necessary in order to overcome a recalcitrant senator.
Motion to take up a bill
Agreement to vote on an amendment
Agreement to vote on final passage
Motion to take up a conference report is NOT debatable, so no cloture there
Agreement to vote on a conference report IS debatable. This conference report has no statutory time limit for debate. Some subject matters have statutory time limits for debate, budget resolutions being one subject matter with a statutory time limit for debate, IIRC.