Zidane is a great coach now. He is very experienced. Manchester United will be very lucky if they get Zidane as their coach. But I'm not sure if Zidane would be interested in coaching Manchester United right now.
In order to see Zidane at Manchester United, something has to change dramatically and even Mourinho couldn't make that happen, so I doubt Zidane can. As long as the club's management doesn't change, Man Utd will continue to play bad football and Zidane is not stupid. He has good statistics and it would be too risky to worsen them at Man Utd.
Anyway, I personally don't believe Zidane will become Manchester United head coach to replace Erik ten Hag. Because after all, the team which has a lot of money and also comes from the same country of origin as Zidane himself in France, but Zidane rejected PSG offer. Therefore, it seems that Zidane is only willing to coach in the teams which he played when he was a player, such as Real Madrid and maybe also Juventus in the future . But maybe, if Manchester United succeeds in bringing in Zidane as coach, then Manchester United will have a good chance of recovering. At least to get a trophy in one of the big competitions like the Premier League, because to getting the Champions League trophy will of course take time.