I can’t use that command if there is no feedback from the Pi itself.
What @DirkS wrote was: If you can log in using SSH you can check free space
If you are already under time pressure I suggest skipping ahead to replacing the Operating System to get you up and running again.
If you hope to salvage otherwise unsaved work, do the installation onto a new/spare/replacement microSD card. Then with the addition of a cheap USB card reader-writer dongle you can use your new installation of Raspbian as a 'rescue workstation' to recover files and data from the suspect microSD if that is still physically possible.