Wandavision is set 3 weeks after end game, in the as she dissapeared after thanos clicked his fingers and returned when the hulk reset, you could assume near the time she meets with clint at the lake after tonys funeral as she is wearing the same clothes.
These events are probably happening around the 6 months before spidermam far from home which would explain mysterios using his multiverse ruse.
She may still do that after all she has been manipulating wanda to find out how her witch powers are so powerful, she may choose to now teach her to control them, and personaly I hope she is redeemed at some point and appear in the fantastic 4 reboot, as she was connected to them greatly
There is a lot to put into the finale, Dotties reveal (probably as moonglow), White vision, whats happened to Monica/ Photon, and tte link to Dr Strange 2.