Trig you have plenty of canes left on it for now. Let it grow and bear. Remember that it bears on shoots that grow of last years wood. You have a well established trunk. Grow your canes for next year off that. Try to leave the center trunk and if it works for you, next year select four canes that grew this year. Prune out the rest and tie those 4 canes to the wires. Leave them all about 15-20 buds long and cut off beyond that. It's hard to describe.
If I remeber correctly, it is a Concord - they break buds late which is why it is starting late this year. It will catch up in no time.