Updates have never been on Friday…
A long time ago the public updates went on Wednesdays, but then got shifted one day to Thursdays.
Well, there’s also the thing of timezones, but Arc posts the updates around 12pm on GMT+7… give or take a few hours, that’s the average.
For my timezone it’s usually at midnight, so technically Thursday, but mentally it’s still Wednesday night.
Then again, itch.io used to send me the mail for the update the following day. Despite me having downloaded it.