I posted a photo of this peniocereus greggii cactus fruit in a comment to a post I made late in September. This is the current appearance of the cactus fruit ripening on the queen cactus adjacent to the east part of the lot by our driveway.
This one, unlike the ones I posted about then, has not been hollowed out by birds or other critters yet. It looks to me like it is turning red like the other ones. I’ll keep an eye on it and post more when there is a change in appearance.
Encyclopedia of Life has these details about propagation of the Queen Cactus:
Peniocereus greggii blooms for 4 to 12 nights each season, with most flowers opening synchronously at dusk and closing at dawn (Raguso et al. 2003). This species is also known to self-incompatible, so pollination by an insect, usually a hawk moth or honeybee, is required for successful fruit maturation (Raguso et al. 2003). Fruits are red, fleshy and ripe during the fall migration season and are dispersed by birds (Suzan et al. 1994).
Update 10/12/2017: The fruit is now ripe and the birds have begun to peck out the pulp. Click on the image to enlarge.