Across years of releases of Mac OS X and macOS, Apple offered a power-scheduling feature in the Energy Saver, Battery, or similar places across System Preferences. You could set a time of day for your Mac to start up (or wake, if sleeping) or shut down. That time could be set to every day, every weekday, every weekend day, or a given day of the week.
With the release of macOS 13 Ventura, the interface to those features disappeared. Were too few users making use of them? Were they irrelevant with the current energy efficiency of modern desktops and displays and the predominance of laptop sales? It’s unknown.
(If you use a UPS, or uninterruptible power supply, to provide emergency backup power to your Mac in the event of a power outage and have it connected via USB to your Mac, the UPS settings remain available by clicking UPS Options in System Settings > Energy Saver.)
Read more at Macworld.com