Thanks

You did about what needs doing but the wrong time of year. You need to root dormant cuttings taken in winter. I suppose yours might grow but I'd not expect it to.

By the way I'm eating Jupiter grapes right now. Try planting that cultivar next spring. It's pretty good for a hardy seedless.

It depends on the training system, how loyally you stick to it, luck of the growing season and how you got the vine.

I got well rooted from a local trained them Kniffen, didn't follow a multi-year pruning plan for the system rather filled it in the first year and had grapes the second year.
I planted bare root mail order, had a couple bad growing years plus dogs chewing them off short and it's taken 2 years to make it to the top wire on an 8' high T, I expect some grapes the 3rd year but I'll have to limit the amount I allow. I have another poorly rooted potted mail order planted last year that between the poor root system and 2 hot drought years probably won't make it halfway to the top wire this year, the way it's going that one could take 5-6 years if we keep on having no rain summers.