How can i redirect the path from the product save button?
Easy to do with Rules, no coding required.

You can import this rule export, but will need to adjust the role ID and redirect path to match

Redirect on product save using Rules

{ "rules_redirect_on_product_save" : {
    "LABEL" : "Redirect on product save",
    "PLUGIN" : "reaction rule",
    "REQUIRES" : [ "rules", "entity" ],
    "ON" : [ "commerce_product_update" ],
    "IF" : [
      { "user_has_role" : {
          "account" : [ "site:current-user" ],
          "roles" : { "value" : { "3" : "3" } }
        }
      }
    ],
    "DO" : [ { "redirect" : { "url" : "somepath" } } ]
  }
}