Travis d’Arnaud had just stood his ground on a play at the plate, saving his pitcher, Matt Harvey, a run. The Mets’ righty patted the team’s catcher of the future a thanks as he walked past. Nothing needed to be said. Just three games into their pitcher-catcher relationship, two players the Mets hope form a powerhouse battery for years to come are already on the same page. “Three starts with him and almost like we’ve been with each other for a couple years,” Harvey said Monday. “I couldn’t say anything better about him learning each pitcher and especially me.” Harvey isn’t alone in his praise for d’Arnaud. The excitement surrounding the catcher, the key piece in the deal that sent R.A. Dickey to Toronto, has made an impression on almost everyone, has spread throughout the organization. “He’s everything that everybody said about him,” Terry Collins said. “He’s catching a lot, he’s had great improvement behind the plate. He’s not just blocking but receiving the ball. He’s got a good arm. And we all know he can hit.” It’s likely d’Arnaud will start the season at Triple-A Las Vegas but probably won’t be there long. “Whether or not he makes the team, I think he’ll be around a little longer,” Sandy Alderson said. “One important thing he’s getting is experience with our pitching at the major league level. So even if he goes down, that familiarity will be very valuable when he comes back.” Read more: