According to Dave Meltzer in the latest edition of The Wrestling Observer Newsletter, Rey Mysterio has yet to agree on new contract terms with WWE, but both sides are not far from a deal. Rey Mysterio is scheduled to once again meet with WWE to try and finalize a new contract.
Mysterio has still not signed a new WWE contract. At last word, as of a few weeks ago, he was asking for a raise and Vince McMahon was not offering one. That may have changed since the last word is that the sides are not far from a deal and McMahon and Mysterio would be meeting once again soon to try and finalize things.
During initial negotiations, Rey Mysterio requested a pay increase, which Vince McMahon refused, citing the current financial situation the company is in, making massive cuts across the business amid the COVID-19 pandemic.