Boeing is set to present to the 1st 787-10 to the world on February 17th. The roll out will be attended by Trump who has criticized the 787 in a past tweet:
In another irony the 787 uses a worldwide supplier base that he has repeatedly railed against and now he'll be attending the unveiling of the largest member of that aircraft family.
Nevertheless the aircraft has had a very smooth assembly thus far and the projected window for first flight is reportedly to March 10th. It does not mean that it will fly on March 10th rather the window ends on that date. I strongly feel, given that this is a simple stretch of the 787-9 and the flawless execution on the -9 development, the -10 should fly by the end of this month.