Al Ittihad continue to increase the amount they are offering to Liverpool. But there is still not a positive answer by Liverpool. They just want to keep him for the season. But next summer they might change their mind on this topic. Because Salah will have one year left on his contract and they might not convince Salah for another extension maybe.
Therefore after this season we can really see him signing for a Saudi Arabia team. It would be really sensible for Liverpool to sell him like that while they can make a lot of money from his transfer fee. Saudi Arabia teams are already eager to splurge on these stars.
Theoretically, Al-Ittihad and Salah (he seems to want to move to the Saudi League) have 20 more days to convince Liverpool to agree to a transfer. The transfer window in Saudi Arabia closes later than in most European countries. But the likelihood that Liverpool will agree is close to zero - now they can not replace Salah with another big transfer until the winter window (actually until the summer).