I mean the update is rolling out so can't guarantee you're getting the update right away but if you want it fast try this method should work https://youtu.be/LIzRbQCj8vk 

Hey guys! i have good news my headset just updated to version 40 and when i go in the experimental features i see 120hz!! so i guess it's fixed go and update your headset's! Happy Quest'ing

True

Your not the only one im also checking it everyday can't belive they haven't fixed it yet, the bug has been here for 2 entire weeks now. LOL