If you set up a SAML app in Okta and provide the ACS URL and Entity ID (https://developer.okta.com/docs/guides/saml-application-setup/configure-saml-in-okta/) you will then have a metadata XML link on signon tab to download the IdP parameters you mention (https://developer.okta.com/docs/guides/saml-application-setup/config-saml-in-app/)
