It's a beauty, Gigi and you sure are doing well with those Catts attached to your oak tree! Some of mine take a few days after opening before they develop fragrance. The flower parts have to mature before the plant attracts its pollinators, I think.
I still have a while to stay and help out here in Salt Lake, before I can see what's blooming at my house. My house sitter says there are "flowers out there" but she's not able to send me any pictures.
I did take a couple of pictures of my Den. aggregatum just starting to open, before I left. Did I post these before? Really hoping there will be a few little yellow flowers left for me to see. There was one spike that was a few days behind the others.