For me, it would have to be mass produced and about an order of magnitude cheaper.
I'd rather not be testing/tasting experimental lab stuff. And mass production bringing down the price with economies of scale is the real proof that the technology is ready.
there's nothing holy about eating real animals (unless you're religious)
i'm no vegan, but if identical lab-grown alternatives are available at near same cost without the hormones, antibiotics, emissions, I'll take it