According to the latest reports, Kane says that he's happy at Spurs and that he's willing to sign a new contract there.
He's probably evaluating his options - there aren't many clubs that can go for him. City got Haaland, in Madrid it would be difficult to pair him with Benzema, Barcelona doesn't have enough money..

Staying looks like a decent option, Tottenham is a good club. Still - if he extends he'll basically spend his whole career there and he's an elite player that deserves to fight for trophies. He will be 29 next month and still hasn't won a single one.