CINCINNATI — Start spreading the booze.

A delivery truck carrying Mets celebratory champagne seems destined for Great American Ball Park this weekend, with only the date for the cork-popping still undetermined.

At this point it might take Houdini reincarnated to prevent the Mets from clinching their first NL East title since 2006.

Hours after the Nationals had lost on Thursday, the Mets handled business against the Reds, leaving the scent of a division title in the air.

“‘Fun’ is the easiest way to describe it,” Daniel Murphy said after the Mets beat the Reds 6-4 and watched their magic number to clinch the division shrink to three. “I don’t need a lot of adjectives, it’s fun. This is a great group of guys and I think we’re having a lot of fun right now.”

Nobody keeps the Mets looser than veteran Juan Uribe, who has made a practice of parading through the clubhouse and chiding teammates watching football on TV: “I love America!” Uribe announced — to bursts of laughter — as players watched the Redskins-Giants game Thursday night.

The Mets lead the NL East by 7½ games and their earliest clinching date would be Saturday, with Matt Harvey on the mound for an abbreviated start.

Washington’s 5-4 loss to Baltimore on Thursday lightened the burden on the Mets before they even took the field.

“We’re getting to the point where every single game is huge for us,” manager Terry Collins said.

After the Reds knocked out Steven Matz and tied the game in the sixth, the Mets responded in the seventh. Murphy’s two-out RBI triple against Manny Parra brought in the go-ahead run before Yoenis Cespedes singled and Lucas Duda doubled to add runs.

“I think that two-out hit has been eluding us just a little bit,” Murphy said. “And then Ces comes up and gets a two-out, two-strike hit and Lucas gets a two-strike hit to extend the lead from one to three and the back end of the bullpen was awesome tonight.”

The Mets received sturdy relief, with only Hansel Robles bending in the eighth on Jay Bruce’s solo home run. Jeurys Familia worked a perfect ninth for his 42nd save in 47 chances.

Matz rolled into the middle innings, but then faced resistance. Adam Duvall’s RBI single in the sixth on a ball that gobbled up David Wright — the play easily could have been ruled an error — tied it 3-3 and ended Matz’s night.

The lefty lasted just 5 ²/₃ innings, in which he allowed three earned runs on 10 hits with eight strikeouts. The three earned runs allowed by Matz were a season high.

Brandon Phillips’ RBI single in the fifth had sliced the Mets’ lead to 3-2. Phillips’ hit was the Reds’ third single of the inning.

Wright and Duda each delivered an RBI double in the third, helping the Mets take a 3-1 lead. Matz singled to start the rally and scored on Wright’s double to left-center. Murphy’s ensuing single put runners on the corners and Cespedes followed with a sacrifice fly. Duda’s double brought home Murphy.

Phillips’ RBI single in the first — the Reds’ third straight hit against Matz — put the Mets in a 1-0 hole. But Matz finished the inning strong with strikeouts of Todd Frazier and Bruce.

The Mets won for just the fourth time in 10 games, but Kelly Johnson prefers the glass-is-half-full philosophy when the topic of the Mets’ recent sluggish play is broached.

“If you were to say, ‘Sept. 24, you guys would have a 6½-game lead with 10 to play,’ I think the whole City of New York would think that’s amazing,” the veteran utilityman said before the game.

“They would be so happy and I know we would and the coaches would and the owners would, so you just have to take the positive of our position, where we’re at, even not playing very well.”