My guess is that the delay is due to it being the first quarter for Zach in the CFO role, combined with Elon having a busy week and likely sitting down to review the SH letter for the first time at roughly 4:05pET. And then layer in some of Elon's bullishness following the autopilot day earlier in the week, and there are some rewrites occurring post-4pm, with Elon wanting to be a bull and the CFO/general counsel pulling him back from the ledge to reduce the odds of anything crazy being stated.