Night blooming cereus draws near

The night blooming cereus in the yard has 11 huge buds on it, and should open soon. The flower buds open at sunset one evening and close forever at sunrise the following morning. Not likely the appropriate pollinator will be in the neighborhood when this subtropical cactus finally blooms.
The cactus shares yard space with two other subtropical exotics--a passionflower vine and a brugmannsia--as well as with my summer camp for orchids, which takes place on a lattice fence under the dappled shade of the pear tree.