Of course, free GitLab is now doing a deploy, so nothing works. I guess Friday night would kind of make sense for that – if you're going to do a 10 years ago, maintenance window kind of update. And your dev team likes pager duty.
(We ran on Wed-Tues weeks for a long time to encourage mid-week deploys as the end of the iteration. More than three full, normal workdays to resolve anything that goes wrong, without crazy heroics.)