Process Integration of SAP SuccessFactors Employee Central with SAP S/4HANA Cloud is based on scope item JB1 which requires certain implementation and operational effort on customer/partner side. Below is a collection of most relevant references to assist you further with these aspects.
Setting up and testing the integration:
SAP publishes scope item JB1 with a newest release each quarter synchronously with the release date of SAP S/4HANA Cloud.
You'll find the newest set-up instructions and test script under https://rapid.sap.com/bp/scopeitems/JB1