For anyone doing their Biometrics in Los Angeles at the ASC on Wilshire Blvd, I went in today as a walk-in. It was fine, they ended up processing me. I went in around 11:30AM and there wasn't very many people in there for all of the chairs they had.
The person at the desk asked for my ID and Letter - then stated my appointment wasn't until next week. I explained that I wanted to see if there were any available openings today to perform the Biometrics. She then passed my Letter and ID to an IO who then questioned why I was here earlier than my appointment. I stated the same thing that I was trying to see if there were any openings today. He then said it was fine, and I waited to be processed. All up the process from entering to leaving took no longer than 20 minutes. Was much quicker than I expected - I thought it was going to be a DMV type scenario.
Hope this feedback helps anyone processing in the LA area.
*Timeline updated as well. Now I wait for my Interview Letter.