I submitted my application for the quarantine free Thailand pass at around 00:30 on the 29th April Thai time. Only slight annoyance was still requiring documents to be in jpg format and not pdf, but the website worked fine.
11 hours later I had been accepted and emailed the Thailand Pass and QR code, no backlogs or drams.
My arrival date was down as 6th May and the pass states entry valid from 29th April until 13th May.