You can check the status of queued jobs with the faxstat command.
faxstat -s will show you your jobs in the send queue.
% faxstat -s HylaFAX scheduler on tove.cs.umd.edu: Running Modem cua/a (+1 301 405 6707): Running and idle JID Pri S Owner Number Pages Dials TTS Status 20 127 R bplecs 93014056707 0:0 0:12
faxstat -d will show you your jobs that have been delivered.