Disclaimer: I know absolutely nothing about working in Saudi Arabia and the culture surrounding it, my suggestion is based on my experience in Europe and the USA.
You are in a position where both your manger and you, are unhappy with the current arrangement. You don't like to be worked around the clock, six days a week, and he doesn't like how little is delivered. Seems like a perfect case to grab his attention and say something to the following effect
Listen, I see that you are unhappy with what I am delivering every week. I am also unhappy with the work around the clock, and the fact that, in the end that's still not enough. I think we should talk and either figure out a plan to make a clean break and part ways or revamp both the long hours and your expectations around my work. Because if things just stay as it is, you will keep getting pressure from upstairs for late-delivery, and I will keep getting stressed over the long hours. So let's sit down and resolve it, one way or another, so we can either start working towards improving this situation or on finding my replacement."
You should be honest with the guy, and since you are already considering to quit, this is very much a last attempt to reconcile between you two. I also specifically formatted it so you will only talk about your performance, not the team as a whole - as you should focus on what you, and you only. It also frames the expectations in no uncertain terms, and you've mentioned that finding people to join the team is hard, so this is his incentive to try and figure it out.
Of course before doing anything drastic like that make sure that you actually can quit, especially check your legal/visa situation.