No, Wedge was not involved at Scarif
It's not known if he was part of Red Squadron yet, but Pablo Hidalgo, a continuity and story development executive with the Lucasfilm Story Group, confirmed on Twitter that he wasn't involved in the battle:
@ShannonGCarter Were Wedge, Biggs, John D, Porkins, Theron Nett, Tiree and Pops at Scarif in Rogue One?
@pablohidalgo Wedge definitely wasn't. Biggs, doubtful. The rest, probably, in that we didn't reassign their call numbers.
He may have been on Yavin
As I mentioned in a comment on the question, David Ankrum, the original voice actor for Wedge1 had a brief voice cameo, as revealed in an interview with sound designer Matthew Wood:
Following his tendency to use the same handful of actors for the vocal roles, Wood has brought original 1977 "Star Wars" actors on board to use their voices for "Rogue One," such as Angus MacInnes and David Ankrum, who played Gold Leader and Red Two in "A New Hope."
Ankrum himself revealed on Twitter that he could be heard over the public address system at Yavin base:
@RenderedAddison I am listening for your voice. What scene is it in?
@DavidAnkrum1 PA Announcer on Yavin. Redirecting the pilots to Scarif!
Whether or not Ankrum's voice is meant to be Wedge is, as far as I know, unknown; Ankrum himself claims as much in his Twitter biography, but it hasn't been confirmed by more official sources as far as I know.
1 Random Star Wars trivia time: Wedge was portrayed in body by two actors: Colin Higgins (in the briefing scene) and Denis Lawson (in the Death Star battle itself), but both actors' lines were overdubbed by David Ankrum