Some people suggest once you have to have monetization configured, you get to see the Scheduled options. But that didn't happen to us. Even after we got verified for monetization, the scheduled option didn't appear.
One way to fix this problem is by using third-party apps like Tubebuddy, however, it might not be for everyone, as these apps login, on your behalf to publish the videos.
How to Enable Scheduled Uploads on YouTube
But guess what, I accidentally discovered a much simpler way to fix this problem. Simply go to YouTube from your desktop and upload a new video. Before choosing a video file from your computer, click the drop-down menu next to "Privacy," then select "Scheduled." Now, upload the video like you usually do.
Once the video is uploaded and processed, you will be able to schedule your video to whatever day and time you want it to go live. Even if you later decided to change the time, you can easily do so by going to Video Settings and look for Privacy settings section, then select a date from the calendar. It works on both YouTube desktop or Studio app on mobile.
We tried it and it worked fine. The only downside is you'll have to manually change Privacy settings to Schedule every time before you upload the video. There is no way to automate this as of now. But if you any other workaround, do let us know in the comments below.