@Dena156 Don't jump the gun. One of the things you are rated on as a host is accuracy. If the photos don't match the reality, you could suffer for that in the ratings.
And it isn't just "bad" to cancel bookings. You get penalized in many ways.
Construction completion dates are not dependable, as you have acknowledged.
Don't be overly optimistic about timelines and trying to list before the place is really ready for guests. That could result in all sorts of issues.
And it would be a good idea for you to stay there yourself before your first bookings.
There can be things you haven't thought of unless you spend some nights and days there yourself.
Like "Oh, goodness, that porch light glares right in the bedroom window at night. We'll need blackout curtains there."