I do hope that they can be more accurate with their timelines, but 2Q2020 is still a long way off. Potentially April for the ready date. I did take your post to be that it would be in the October update for September, but even adjusting for it to be the November update concerning status in October, i don't think they'll be there.
The fuel cells themselves don't account for 50% of the project. So even if they are fully conditioned on time, I don't see the project status being reflected as 50% complete in November's update.
I would expect construction to happen quicker at the tail end than at the outset of the project. As such, i would expect the Fuel cells to be ready by end October/November and requisite construction completed before the fuel cells can be moved to the site by around December. Then fuel cells moved and installed somewhere before end of January and then the remaining project requirements completed by end of February with March and potentially April to run all necessary diagnostics and checks.
In that scenario i would consider the project 50% complete somewhere between November and December.