Thing is when you mma-height-math these photos, it never works out in a rational conclusion. Tyson fury is only a little taller than Pereira(6'4) from a picture, Tyson Fury is a little taller than Deontay Wilder(6'7) from a picture, Tyson Fury looks a similar height to Hafþór Júlíus Björnsson (6'9) from a picture. Tyson Fury looks similar to Joe Joyce (6'6) in a picture where he's on his tippie toes.
Basically posture, shoes, angles, perspective, all can give off a certain impression from these 2d images shared around on the internet. Long story short, I reckon Tyson Fury is 6'9.