It'll stick my neck out, I'm not an ITK but I believe Pogba is done, or close to done.
Juve know they can't keep Pogba forever, they are a club like Atlético Madrid now. They have big assets and good young stars but they know they will have maybe 2-3 seasons of a player and then if a big offer comes in they sell. What they do is they have a series of targets for when that happens to replace the star.
I believe that's Pjanic this year, we all know Real Madrid was the big club in many ways because of Zidané and the global icon that is Real, for a french star like Pogba it's not always Madrid who he wants.
Juve know Real Madrid is traditionally the big bucks but United are out muscling Real, completely priced out Real not only for the club fee, but for the agent too and wages. United can't be beaten.
Ontop of my point above, Real have a transfer ban next year. This is THE summer to sell Pogba or the money will start going down for the fee as he gets older, unless theres some crazy inflation. If Juve are selling him it's this year not 2 years time.
I personally think its 80% done, the agreement sources have said for a while is agreed in principle, even Balague isn't shy to say this, it's just the club who needs to be persuaded but it's a huge fee more than the asking price.
Juve will have some big buys in the summer, a better squad by letting Pogba go, they'll do it.