Time has finally come for Amazin’ youngster

DENVER — In a Lost Season there’s at last an exciting reason to watch the Mets. Hallelujah. Amed Rosario, the shortstop of the future, finally becomes the shortstop of today when the 48-55 Mets play the Rockies on Tuesday night at Coors Field.

The time is right, according to GM Sandy Alderson.

Rosario, 21, has had just enough seasoning in the 2017 campaign at Triple-A Las Vegas to play with the big boys.

“We wanted to get through the deadline and try to resolve some of the positional issues that we had,’’ Alderson said Monday in a conference call. “[Asdrubal] Cabrera has moved to second and ultimately to third. We think that Jose Reyes can play well at second. [Neil] Walker can play some first base and second base.

“The flexibility that our infielders possess allows us to move some pieces around to give Amed an opportunity to play shortstop,’’ Alderson added. “It was a combination of just getting through the hullabaloo of the trade deadline and at the same time, allowing some of our other players to get more famil

iar with some of the other positions. Plus he’s continued to play really well, so.’’

All that was a long-winded way to say basically the Mets didn’t want Rosario up until Aug. 1. Alderson had a master plan and stuck to it.

In the Mets’ minds, Rosario was not ready. Now he is as ready as he ever will be and, according to scouts, there still will be some growing pains.

“He still has a tendency to chase pitches, he’s really going have to watch that,’’ one scout who observed Rosario this past week told The Post.

It’s live and learn time and that’s half the fun of watching a young player make the jump from Triple-A to the majors. Sometimes young players advance quickly at the major league level, witness the Yankees’ Clint Frazier.

All this took a little longer than Rosario wanted, but the Mets finally accepted his bended-knee proposal that was made in mid-July on social media.

Rosario plays with a flair and a smile, and that adds to his allure. On Monday, on social media, he posted: “The impossible only exists in your mind.’’

The 6-foot-2, 189-pounder is a product of his generation, is fun to watch and has a personality.

There are no meaningful games for the Mets this season after a World Series visit in 2015 and one game of postseason play last year, so this will have to do.

Watch Amed grow. And go (he has 19 stolen bases).

Unlike the Yankees who are going for it all, delivering a young exciting team to the fans, and now Sonny Gray, the Mets are going nowhere. So be it.

Rosario is going somewhere and Mets fans can smile again.

Noah Syndergaard and Matt Harvey remain on the shelf, they are still throwing on flat ground in their comebacks, but Rosario is raring to go in the high ground of Coors Field in the Mile High City.

Good times are back at shortstop, going back to the days when Reyes was a young Met and was so much fun to watch. Rosario will make his debut against Rockies right-handler Jeff Hoffman.

Curiously, Rosario will not play shortstop every day the rest of the way, Alderson said.

“Rosario is not going to play every day,’’ Alderson said. “He’s never played that many games in a year.’’

Rosario has played 94 games for Las Vegas and owns a slash line of .328/ .367/.466.

You would think the Mets would want Rosario to get every bit of experience he could heading into next season, but the Mets don’t work that way. They often expect the worst. Remember, they did not call Rosario up because they wanted to trade Cabrera, who was upset at not being at short anymore and they didn’t want the kid to be around such a negative situation.

Cabrera is still here, maybe he will locker next to Rosario. Reyes, his mentor, on one side, Cabrera on the other.

All that doesn’t matter. What matters is Rosario is finally here and Mets fans can enjoy watching him grow.