It is unlikely that Real Madrid has a lot of money at the moment. You shouldn't expect big purchases. Although they can buy Mbappe. The reconstruction of the stadium is coming to an end. Real Madrid will spend another season with old players, and in a year they will make a couple of good purchases and build a new team.
The stadium construction always takes time and requires huge fund from club. Real Madrid has better balance sheet than Arsenal and they still bought players, even made some big transfer with Haaland, is.
But this appearance of pandemic attacks their budget and it is not a strange thing in football. Many clubs are suffering this issue.
I don't think Real Madrid will spend big fund for Mbappe transfer. They can make the the transfer but pay the transfer fee gradually each season. The same as what PSG did with transfer of Mbappe from Monaco to their club.