It's a but further off than you might think. Even the Vision Pro is on the border of acceptability for working and reading in, and that's literally the bleeding edge of miniturized display technology. Going from a traditional flat panel display to a waveguide and projectors with an optically transparent display is a MASSIVE endeavor, at this point is essentially limited by physics (bound by current research) let alone issues with heat, battery life etc.

The AR products that eventuallg spur mass adoption are almost guaranteed to be backed by billion dollar investments, with the expectation of more user data than ever before.