So far, United haven't made any high-profile transfers, even De Jong's deal is still pending. Even if you are a big optimist and assume that everything is as you think, what options do United have now? It seems that by the start of the season, in the best of circumstances, they will start the season with about the same team as they were last season, not stronger (but actually weaker, at least in names).
Well, if we look at the "gossip" of the year, we could say they may get Ben Yedder, De Jong, Eriksen, Martinez, Antony. These are HUGE HUGE names if they could get them. Okay maybe Eriksen is not that big anymore, but the rest are quite huge. Antony alone is a big enough name because many believe he is the best player in Ajaz right now, Martinez is a young great player, and De Jong is a star level player.
These three alone would be amazing and very good for their future, Ben Yedder is a bit on the older side but still great. I am not saying they will get all of these, but they are chasing these names and they are good names to chase, I hope they get lucky.
Rumors haven't translated into deals yet (and other teams have already made a lot of stellar deals in the meantime). While the auction is going on, Pogba is already gone, Ronaldo is already 99% gone. And I would not say that the names you listed will be full-fledged replacements even for Pogba. In the future, these players can become much stronger and prove themselves, but now there is no guarantee of this.