Yeah I assumed I'd need to use Testflight, but it's not even there yet.
You need to be invited to a beta for it to show up in Testflight. Testflight doesn't support open public betas.
it’s not in waze beta yet either though
On Friday they pushed a uuid beta/submitted testflight beta, according to their latest email. I just got a waze testflight update today, so I'm assuming that was what was pushed.