As of about 2 yrs ago, Symentec gave you a tracking number with your submissions. In this case, the item was whitelisted in about 3 hours. Despite the automation, you can tell people are looking at these closely and "triaging" the submissions. In this case, it was a compoenent of the Edge DEV build--something that maybe got priority over more esoteric submissions.
Has this turn-around time improved any since 2019? Three hours for a mainstream browser component seems a little high. If AVAST can whitelist in 15 min, that would be an asset for sure.