Okta Saml Integragion

Hello,
I have created app in Okta account with SAML2.0. Everything okay even show everything okay in SAML federation tab. My requirement signin okta with saml2.0 and get user details in success page. But not able get details just got list of IDPs and if click over that IDs redirect to Single sign page rather than to get user details.

Please collaborate me.

Some other questions:
1)Can it possible from database user details from login form send for okta verification and return response with authentication.
I use saml sdk:
https://simplesamlphp.org/docs/stable/

2)Sign with Okta work like facebook login or gmail login?

Thanks