tout au long in English:

Perhaps they had been mistaken all along.

I don't know how they found out, they've known about it all along.

She was observing you all along to find out how much money you could have.

I knew you were joking all along.

I tried to keep a secret from my parents, but they knew the truth all along.

all along the catwalk

Something in Shindig finally brought this issue to light as the contextDestroyed function has been missing all along.

Chapman had known all along that the plan wouldn’t work.