A bit fuzzy at the moment.
By beginning of March the statement was that first flight would be in “second quarter”, so latest in June 08. Now, in the meantime new rumors about delays surfaced and the first flight might be delayed even further. But there is no official Boeing statement yet and I guess we will have to wait until the Boeing management feels they can deliver something more believable after they misguessed their technical problems five times before.

The Power On wasn’t achieved yet, and from Power On about two month are needed for first flight preparation. As we now have 6th April, we can see that the June window gets increasingly tight.

Next question if Boeing pushes for first flight at all costs or if does rather focus on an achievement of a proper flight test program. A well prepared flight test will result in less surprises.