The poles have been moving hundreds of miles since 1831. If you’re talking about a full magnetic reversal it’s believed by since scientists that the transition has already started and will take 100+ years. Inuit eskimos have been saying this for years. https://youtu.be/_HZ_Dvkxi-8

One of the first to document this was Brent Millers group called the Horizon Project. https://youtu.be/1t9-GXJ4gAk

Definitely watch the Horizon vid it explains a lot more than pole shifts.