If you need to determine if you have https or http uri, try this PS script.

$site = (Get-SPWebapplication -IncludeCentralAdministration | ?{$_.IsAdministrationWebApplication}).Sites[0]

$wfmProxy = Get-SPServiceApplicationProxy | ?{$_.TypeName -eq „Workflow Service Application Proxy“}
$wfmProxy.GetWorkflowServiceAddress($site)