And you're not alone with that. Spotify HiFi was announced in 2021 and to this day it's never actually launched - not even by 2026. There were a few limited tests in individual countries, but for most of us it remains a promise on paper. I check my account regularly and it's just never there. Spotify seems to have dropped the topic somehow, without saying anything about it.
The most frustrating thing is that as a paying customer you're just left in the dark. A practical alternative that I use myself: If you're willing to upgrade your setup, you can connect Spotify via desktop with external audio apps like Euphonic or similar tools - that already gets more out of the bitrate. Or honestly, if audio quality really matters to you, it might be worth switching to Tidal HiFi or Apple Music Lossless. I know that's not the answer you want to hear, but Spotify doesn't seem to want to make this move.