I realize this comment is likely coming in too late to be of use to you now but thought it might help someone else later in the same situation. This is a comment from the peanut gallery, that is someone who has not touched a unix machine in over a decade so be wary of this comment. You may not be able to see the output to get information on the status but you might be able to see the input to give information on the status. What I am suggesting is to use a command to see what files are open by restic. I am presuming that restic methodically goes through directories and files. By occasionally looking at what files are open you may be able to determine a rough status. To get the pid:
ps -ef | grep -i restic
Then using the pidnumber
lsof -p pidnumber | more
Since restic is written to use multiple cpus there will be many files open but it may give a hand waving approximation regarding the status.