I googled and found this post where they tested a similar setup and it failed at 99lbs at 15cm, which looks way way less than the weights you have (plus you’ve got support on two sides, so only like 50% of the load has less support).

I guess the lesson is that the mortise and tenon is very strong, but pocket screws can support a lot of weight too and that’s good enough!

https://woodgears.ca/joint_strength/pockethole.html