I have started releasing my music tracks since January 2019 in Apple Lossless format. They are created from the wav file masters at 48KHz, 24bit. They should play on all computers running iTunes and on any iOS device since iPhone 7. Support for other devices is unknown.
The files are large compared to the compressed formats but still manageable. The benefits for the average listener are debatable and more than likely unnecessary - so I imagine most users will continue to use the AAC files (the red icon on this website).
However for those amongst us who strive for the best - this is the best I can do. So other than the musical content, the Apple Lossless files are the best possible quality.