I don't think waiting until the end of the window to judge is always fully applicable. It would have been in recent seasons due to our dire straits.
We can't assume that it will all come together, and the longer you leave it, the greater the risk of ending up with nothing for a given position.
I think we're one signing behind so no need for panic. There is a need for a little concern, that's all.
I would look at Friday 8th August as a key date, if we haven't done sufficiently more by then, and that's being generous. Traditionally the final week before kickoff is not busy and there is a natural gravity to push everything out to the final day / week afterwards.
In reality though we need another couple in by a week earlier than that if possible. If not then there will be wider questions asked in the media as to why a much-heralded summer reset appears to be going wrong.
Regardless of this, we'll need to do loan business in the final week and that will have it's own importance.
Whatever way you look at it, the time to be busy is approaching fast.