You’re not Doctor Somebody until graduation. On the day of the viva you’ll pass, you’ll shake hands perhaps, and after that you’ll smile whenever someone uses the title.
It’s not official until the corrections are done, checked, passed and after that until the first opportunity for graduation. Universities have ways of doing things that stretch back through years of tradition, after all.
You’re not a doctor until you graduate…
…but there’s no great harm in telling anyone and everyone that you did it! You’ve done it! You’ve passed, succeeded and completed!
You have to wait for a piece of paper before it’s official. So be it. You know what you know and you’ve done what you’ve done.