Ragavie,
Hi. Based on your support incident that you opened and now confirmed (closed), we mentioned that most of our out of the box products like Work Manager or Inventory Manager interfaces with the ERP Mobile Syclo addon BAPI to SAP ECC. All work in this area is being handled by consulting or SAP consulting engagement.
The question about: "If we migrate to SAP S/4HANA, on-premise edition 1511, SAP Work Manager 6.3 or SAP Inventory Manager 4.2 OOB will be supported."
The answer is: the product team (developers of Work Manager or Inventory Manager) will delegate this question to consulting. So hopefully with your question above, if any of the consulting member have any experience with it, they may respond.
Best Regards,
SAP Mobile Support Team