I cannot see why people believe this will go anywhere near to the end of the window, to secure the deal. It's a release clause, so no price haggling, which is what usually holds most transfers up. The Haaland team have been planning this for some time, and it is not as if he is tied up with playing football at the moment. They will have a package figure in mind, and he will have a preference for club, so I think it is whether his preferred want to reach that figure.
End of the season, not end of the window.
Even a couple weeks into the window, wouldn't be a surprise.
People are expecting his next club to be announced, well any minute, since last week. Can't see that.