Though unfortunately expensive, impossible burgers and ground 'beef' are virtually indistinguishable from the real deal already
I'm probably up to, like, 90% vegetarian these days (it's been a long road lol). I can definitely tell the difference with Impossible/Beyond. But they're absolutely "good enough" for me. The good thing is they're still improving, so can only get better. But yeah, they're quite expensive (nearly twice the cost per pound of regular ground beef). I tend to wait until they're on sale, buy in bulk, and freeze them.
If I'm at a cookout or potluck and make burgers, I usually have to label the Beyond/Impossible ones or people react badly. If I'm making things like chili / tacos or sides like Hamburger Helper and such, people can't tell at all. The only giveaway is that they're in the vegetarian section of the table.