I am not sure to talk about Madrid's financial stability, but if we consider how much Real Madrid already spent their money to sign new players this season, they should still have much money now. So far, there are no new big players besides Alaba. I guess this is because Real Madrid prioritizes their funds to sign another new big player. Since Real Madrid is interested in Mbappe and Mbappe already refused his extension contract in PSG, I believe he will go to Real Madrid.

Well, I assume Real Madrid knows the chance to sign Mbappe is quite high now, so they hold to not sign another big player till now.