The irony is that Tuchel has not come out and said he wants a ST, has he? It's all just paper talk since the end of last season.
Anyway realistically speaking, while the transfer window may close only on August 31, if there's still nothing moving regarding Haaland after this week or next week, then I doubt a move is gonna happen because the season is starting very soon for Dortmund and selling him then would leave them very little time to find a capable replacement.