This.
In order to finalize your order, you have to complete the financing/payment part. Most people will do the Tesla financing and eventually get upset later on when their delivery is taking more than 60 days, and their loan terms are expiring. Some people (and people on this board or in the FB groups, because they do their homework) will select Cash to finalize their order and then worry about their payment options later. By selecting Cash (or Self Arranged Financing), you'll be able to get a MVPA that you can use towards another auto loan, and then rate match it with Tesla to get a better APR and then stick with Tesla financing since it's usually easier unless you're established with a CU or a specific bank.
I haven't seen anywhere that says when your account was finalized, only when you started your order and put the deposit down (it's listed on your Order Agreement). However, once you finalize your payment option, then the next day is when you'll see an EDD on your account. I just went through this for a 2nd time yesterday when I placed another order for a Perf this time, just to see which car will arrive first...... right now the Perf EDD is much sooner than the LR EDD.