7:58pm: D'Arnaud will be activated for tomorrow's game, Terry Collins told reporters (including Mike Puma of the New York Post).

7:18pm: D'Arnaud has been activated for tonight's Mets/Padres game, Mets manager Terry Collins told reporters (including Adam Rubin of ESPN New York). The team is still deciding whether to rush d'Arnaud to San Diego and have him arrive mid-game, or simply have him wait until tomorrow (according to Mike Puma of the New York Post). Buck is being placed on the paternity list as his wife went into labor earlier today.

AUGUST 9: The Mets are likely to promote top catching prospect Travis d'Arnaud, Adam Rubin of ESPN New York reports (on Twitter). D'Arnaud would fill in for current starting catcher John Buck, who will soon go on paternity leave. Asked about the possibility of a d'Arnaud promotion, Mets GM Sandy Alderson recently said, "Right now, there isn't a real good reason not to," according to Newsday's Marc Carig (on Twitter).

D'Arnaud, who has missed most of the season with a foot injury, had been on a rehab assignment in Double-A Binghamton, but the team recently promoted him to Triple-A Las Vegas, the same city where he hit .333/.380/.595 last season, when Las Vegas was a Jays affiliate. The Mets are beginning a road trip to Arizona, Los Angeles and San Diego, which means that, with the promotion to the Pacific Coast League, d'Arnaud will be nearby whenever he's needed.

D'Arnaud was originally drafted by the Phillies, who shipped him to Toronto when they traded for Roy Halladay. The catcher was then one of the Mets' key acquisitions in the R.A. Dickey trade. MLB.com's Jonathan Mayo ranks d'Arnaud the No. 22 prospect in baseball. Before the season, d'Arnaud was ranked No. 14 by ESPN's Keith Law and No. 23 by Baseball America. BA's 2013 Prospect Handbook ranked him the No. 1 prospect in the Blue Jays system, noting that he makes "consistent hard contact" and that he has improved behind the plate as he's developed.

If d'Arnaud were to stick in the big leagues, he would surely miss the cutoff for Super Two eligibility. That would mean he would be eligible for arbitration after 2016, and free agency after 2019.