Suzuka. They'll have at least one power unit ready to go by then. Question is, do they take penalties at their home race? If I were them I would. It's going to be painful watching them race in Spa and Monza.
Let's hope the chassis updates can deliver a tenth or two in Hungary, and they can eek out another tenth or two from the current power unit in the mean time. They're on the cusp of being able to score points regularly, it's so frustrating to watch. At the very least let's hope reliability has taken a step forward. Getting the gap under 1.7 seconds makes them the 4th best team.