People that joined the waitlist on the day of the keynote should be getting their approvals by now, assuming they're letting people first come first serve. Once again, indexing does not seem to affect how fast you get in. Some of the "ask Siri" features seem to be buggy, both on Mac and iPhone, but it works pretty well for a dev rollout. I waited for around 48 hours and I joined the waitlist around 90 mins after the keynote ended.

I've just gotten access. Can confirm Indexing is not related

Please make sure your Siri Language matches your Device language.

Apple made a statement saying they'll roll it out within a couple of weeks so we might have to wait for a bit.