According to co-founder Sam Altman, today, day 3 of it's launch, one person is being verified every 8 seconds for their World ID.

https://endtimeheadlines.org/2023/07/worldcoin-has-arrived-just-get-your-eyes-scanned-by-the-orb-and-your-new-world-id-will-be-issued-to-you/
“Worldcoin” has arrived - Just get your eyes scanned by “The Orb” and your new “World ID” will be issued to you
(OPINION) Have you had your eyes scanned by “The Orb” yet? All it takes is just one trip, and once your biometric data is in the database you will...