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The color of the vine also indicates when to harvest Concord grapes. Throughout the growing season, the vine and stems are a light to medium green. When the vine and stems begin to turn to a light then medium brown, it means the grapes are ripening and ready to harvest.
Same rules as in the Northern hemisphere. If they look big enough and have changed from that hard green look to the color of the ripe ones you see in the store they are ready (tougher to tell on green gage plums but even those get a little more yellowish when ripe). If they look almost ready you could pick them and let them ripen indoors.