They tend to open up late at night (10 pm and on) and close up before morning. I call them midnight bloomers and it's always an event to stay up late enough to see the blooms fully open and breathe in that fragrance!
I saw several more buds on another of my EO. I have several large ones in floor pots with tomato cages attached to the (nursery) pots. They have wandered up the cage and are now past the top of the cage. I have to cut them back when they get too tall or drape them over the top of the cage and down again. If I was in zone 10, I'd grow one up a tree in my yard. But it gets too cold here in the Winter and I have to cover them. On the coldest nights, I have to bring them into my garage because they are only good down to about 45 degrees. But they can sure get really tall!