In the debug logs that are downloaded through the cloud console or from the connector box directly you will see the following line if successful:
2016-11-09–05-08-58-295 [CHECK_IN_SERVICE-1] INFO com.mobileiron.kocab.commands.LdapSyncCommandHandler - Command [XXXXXXXXXXXXXrandon hex numberXXXXXXXXXXXXXXX] Type [LDAP_SYNC] - LDAP sync command handling completed with status [ACKNOWLEGE]