I was able to upgrade my park hopper tickets to Sorcerer's passes Wednesday afternoon. The CM told me the current wait time for ticketing services was 3 hours and tried to talk me into calling back another day, but I asked him to add me to the queue. At that point, he told me he could set me up for a call back and that the call back time would only be about 30 minutes. So, that seemed like the way to go.
Sure enough, I got a call back about 30 minutes later. However, when I told that CM what I needed, he mumbled something about having to transfer me, and off to hold I went! But an hour-and-a-half later, I finally talked to a CM that could do the upgrade. It only took her about 5 minutes or so.
My new passes showed up in My Disney Experience immediately. But oddly enough, they show: "Expires Monday, Jun 13, 2022". Of course, I haven't even activated them yet, so I don't know what's up with that. I'm guessing it's just a placeholder date until I activate the passes.