Neymar will continue to play because Al-Hilal bought at a high price even though he will only be absent for not too long or only in the first round, he will definitely try to show the quality of his game and this is a form of respect for Al-Hilal officials who have given him a large salary.
I think Neymar's injury will also heal soon, it's just that it takes a little time so Al-Hilal already knows this and accepts all the risks that will be accepted in the short and long term.
As mentioned Al Hilal social media is doing right job for the Neymar because main purpose to bring him in Saudi League is some good social media activity instead of having him on the ground for the game, mostly peoples understand how things were going into PSG while he was staying there and having luxury contract with them now latest updates showing most chances he will join his team in September, but things are going as Al Hilal wants if he is able to give them few good matches then surely all investment is going to have filled.
Ronaldo having two and half years contract which is going to end in 2025 then most chances at the age of 40 he will retire from soccer but still stay in soccer because now he is brand ambassador of the Saudi League and Al Nassr soccer club, and they want him to stay until 2030 which is long time hopefully things will be good for them during this time.