(Birds think so anyway

Pic taken today:

These are eating grapes (rather than specific wine makeing ones), but they are fairly sharp and have a fair bit of tanin and lots of pips.
About 3-4Kg I reckon, so probably too many to eat and not enough for wine, so I thought they might work in a 5 gal batch of TC? Tannin may help and should give some body?
As you can see they have a yeast bloom so should I soak in some sodium met solution overnight to hinder this?