Yep, those are elderberries alright! If you let them get even more ripe, they will develop a white-ish coat on them, sort of like when blueberries get very ripe too.
Remember to get rid of all the stems as much as you can! They create a green goo that is hard to remove. Keep elderberry wine in the dark as well, as light, especially UV light, will damage the color you get and turn it an ugly brown. It doesn't affect taste, but it sure makes it look ugly. I keep my carboys covered for about 1 year, then bottle, and wait 6 more months. Taste it to see if it is palatable then. Otherwise, you will end up with a tannin bomb of a wine. It takes a while for this wine to mellow, but when it does, it's very very good!