The Kindle edition of On the Shoulders of Titans has been submitted for publication. Assuming I didn’t make any mistakes, should be approved and available within the next 72 hours.
The paperback version will be just a bit after that, probably within the next couple weeks.
The audio book edition will take considerably longer. This is because the audio narrator will need to find time in their schedule to record it now that the book is finished. This could take a number of months; it depends on the narrator’s availability, as well as the amount of time it takes in post-production, etc.
I’ll make a post when I get confirmation that the book is available for purchase.