Next time you should use 'pv' or 'bar' to monitor the progress. You can't do that now, because it is running.
One thing you can try is use 'ps' to find the process id and then go into '/proc/process_id/fd' where process_id is the process id, and you can check the various file descriptors there 0 is stdin, 1 is stdout, 2 is stderr. Try using tail on one of these, but it depends how you ran tar as to what info you can get.
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