Come to think of it, probably at least twice as many by now. Even more, if growth has not been linear ...
if you're including epub novels, that have never had a print done... then yeah, at least is gonna be the operating word, likely multiple times considering just how many fiction books are being produced on webnovel sites and then published as epubs for their fans to buy and support the author.
(The only one's benefiting from that are the slop "shovels" purveyors to the AI-slop gold rush ...)