2-3 weeks before we get the test event info.
Joking aside, my gut instinct is that we won't be in until the 2019-2020 season.
I think we will be in this season by the end of March, we need to get some games in there before the start of next season to become familiar with it, Levy will want to know logistically what it’s going to take on a packed match day etc to avoid issues next season.