I don't think so but they are quite small and blurry in the picture.
You can remove one of these preflowers - it will not stress the plant. tweeze it open and get in there with some magnification... if you see 2 hairs you know it's female. if you see some nanners inside, it's
male. if not familiar with how these look, go to google image to find some comparisons... they are distinctly different and easy to distinguish. A hair up close will be white and "fuzzy" and there will only be 2 of them per calyx, though that may be difficult to see when bunched up inside before they pop out. Nanners will be like a bunch of bananas resting inside, hence the name.
These look like they may be slightly open at the top for some hairs to pop through. this would not be the case with a pollen sac. they don't split open until more development has occured.
If you dissect one, you can determine sex even earlier.
Another easy way to distinguish - male preflowes will form a cluster and female preflowers will not... you'll have only 1 calyx per branch. They may be enveloped in late flower, but still only one calyx originates at that specific spot. This is much further along in development and you risk and open pollen sac, but if you see a cluster of pods ("grapes") or instead of reasing in the nook is a attached via a twig-like projection, you know it is male.