20was%20formally%20elected%20by,or%20demoted%20on%20November%2011.

Under Obama, a lot of transition work was done pre-election. For example:

In an example of "how removed the transition process is from the tumult and rancor of the campaign", representatives of the Trump and Clinton transition teams began holding a series of meetings with each other, and with White House officials, to plan details of the transition process.

Obama called trump on November 9, and met with him the next day.

There's plenty more in the above article.

Biden would certainly want access to the daily security briefings, security and military leaders, and the corona virus team, to name a few