With the new What If...? Trailer dropping, the big finish to Loki, and updates on Monica in The Marvels, each time the MCU gives us something new this is my only thought.
if vision quest is about white vision regaining his memories. even if she's dead, wanda should be in that.
you can't give me wandavision and then pretend that vision's memories wouldn't largely involve wanda. or you can, but then that would carry a through line of wanda caring more about vision than he does about her (or, at least, that his priorities were/are different - which you can support with infinity war and his decision to go jump into battle and leave wanda once he noticed the avengers needed his help). and regardless, she would and should still be part of those memories.
that would be the best place to confirm or deny what the mcu official timeline is speculating re: wanda's death because a white vision who truly regained his memories would also probably seek her out, depending on how he relates to those memories, even if he doesn't accept them into who he is or decides to be.