Whilst there is no definitive information the outstanding bug list may give you a clue of how much remains to be done: https://github.com/sonyxperiadev/bug_tracker/issues
I am sure that I am not the only one to take advantage of Jolla Shop offer of buy one license get one free last December with intention of applying to Xperia 10III, however I thought maybe erroneously that this voucher only valid for 6 months so will expire next month without its release.