You and me are both going through it with first year switch, foggy. I frost seeded it this past winter, and I’m not feeling too great about it now.
One way to ID it is to roll the stem back and forth between two fingers. If it’s nice and round all around like a toothpick or pencil, it’s likely switch. If it feels more flat on two sides, I believe that’s foxtail.
One more thing too, switch won’t have shoots off the bottom of the plant in a 45 degree angle like your plant does.