Travis d’Arnaud’s return to the Mets couldn’t come at a more opportune time, but there still are question marks on whether the catcher, who hasn’t played in a major-league game since April 25, can make the impact the Mets need right now.

“We don’t know yet,” manager Terry Collins said. “We don’t know. He hasn’t played in the big leagues in a long time . . . You hope, you’re hoping his bat adds something to us but we have nothing to go on right now.”

D’Arnaud is expected to rejoin the club when the Mets resume action on Tuesday. It’s likely that backup catcher Kevin Plawecki will be sent down to make room for him. D’Arnaud strained his rotator cuff earlier in the season and has been making progress with the Mets’ Triple-A affiliate in Las Vegas. He got off to a slow start this year, going 9-for-46 (.196), but hit .268 with 12 home runs and 41 RBIs in 67 games last year.

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Flores at third for now

Collins said that the third base job officially goes to Wilmer Flores until the Mets figure out a different arrangement. The manager said he believes the position stability has helped Flores’ bat in the last month. He’s 16-for-48 (.333) in June, and having utility men like Kelly Johnson and Matt Reynolds gives Collins the flexibility to keep Flores put.

“I know in the beginning, [the difficulty] was that he wasn’t playing more, but I’m not too sure that bouncing around the infield didn’t affect him, too. So I’m going to leave him.”

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Ailing arms

Reliever Jim Henderson underwent an MRI on his shoulder Sunday after leaving the game in the seventh inning Saturday with what the team said a shoulder impingement . . . Steven Matz reported no ill effects from his start Saturday. He left in the sixth inning and said his elbow had tightened up, but “he didn’t seem too concerned about it,” Collins said, adding that Matz did not specifically ask to be taken out of the game.

Collins opted to take him out because of his high pitch count.