It would have been of minimal help without extensive time to rework, time that would be most unlikely. The British had major issues of their own in the Med (two months after Midway they would lose THREE carriers during Operation Pedestal)m and in the North Atlantic. The U.S. had actually stationed the Wasp in the Med starting in April to assist in efforts to get Malta's Air Group back close to complement, with the second mission mot being completed until May 9th (this is why she was not available for either Coral Sea , where her presence could have been decisive and lead to the IJN losing either Shokaku or Zuikaku, maybe both, nor Midway).
British carriers and U.S. carriers at the time were not very compatible. When HMS Victorious was seconded to the U.S. as "USS Robin" she required a couple months of refit to operate with U.S. aircraft , have a LOT of additional AAA mounted, and to get even the basics (like radio frequencies and "lingo") onto the same page.
Capacity-wise, the U.S. would have benefited from the RN's fighter control methods, especially if the RN deck was operating with Yorktown) but non e of the British carrier had a substantial air wing, often only have a minimal CAP of capable fighters (Sea Hurricanes or Marlets (the FAA version of the F4F) or having a more substantial fighter force by few or no attack aircraft. A carrier with a hanger full of Sea Hurricanes accompanying Yorktown would be a gift, one with a hanger full of Fulmars and/or Albacores much less so.