Well, you asked.... I had watched this plant evening after evening, until at 9 pm I took the first pictures of the buds opening. I went inside and - since I had to get up at 5 am the next morning, asked DH to go and take a picture before he came to bed. Put the camera and the flashlight right in front of him....
Yeah, you guessed it. He forgot.
So - my first picture is from 9 pm and the next is from 5.30 am.... one time a year this things blooms and I don't get a good picture!
I'd say yours is ready tonight, if not, then surely tomorrow.