Hi All, I was wondering if there is any way I can deploy a script on all most all NS Page ?

There is an option for "- All Records -" under "Applies To" when deploying the script.

Will this deploy on all standard pages?

It will deploy on all the SuiteScript Supported record.

No. I want some script to be deployed in non ss supported page ?

No Supported mean exactly that, you can't...