What do you mean? Everyone has access to the gpt-4o model right now through ChatGPT and the API. Sure we don't have voice-to-voice but we have a lot more than what Google has promised.
All my apps are updated in the App Store too.
Website also only has toggle for 3.5 and 4 with the Plus upgrade. Not sure if it's cause I'm in Canada?
Edit - it does list the new model in my app at least
The bigger issue is that 4o without the multi-modal, new speech capabilities or desktop app isn't that different to GPT-4. And those things aren't yet launched.