I am wondering the same thing.
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It's now 25 minutes after the 10am start, and I see that many videos are available. It sure would be nice if somewhere at the top of WWDC20 they simply posted at the top, or in the about the conference blurb, "Pre-recorded videos for all the sessions scheduled on each day will be made available shortly after 10 AM for viewing." Or something like that. Without stating as such, For the past two days I was trying to figure out when to schedule my attendance at each session, with zero information available on how the online-only format would work.
Time to enjoy the conference videos.