A good rule of thumb will be waiting at least a month from the date of release, and if that date of release falls outside of an app cycle, go for the next app cycle. So like if a game comes out April 16th, a month would be May 16th, meaning you can reserve for the June app cycle (reserves the last week of May).

Since this canon was released in May and June 29th is in the middle a reserve cycle, you'd be free to app anyone from the mobage for the game opening!