The documentation for the FRC API doesn't currently say what data will be available about matches, but that it will be announced later.
Currently, here's all it says (via https://frcevents2.docs.apiary.io/#r.../score-details
Response Details 2018:
MatchScore: matchLevel - type of match
MatchScore: matchNumber - match number within the tournament level
MatchScore: TBA - more details will be announced later
I haven't seen one, but has there been an announcement that I may have missed that said when this might be?
Also, has anyone been paying close enough attention in years past to see at what point in the season it's been updated for previous games?