@asnecemnnit did you specify the proper board serial number in place of OPENOCD_SERIAL? also, you might need to repeat --project-option before each option:
tvmc run --device micro tvm/apps/microtvm/zephyr/template_project/project_cnn --print-top 6 --project-option zephyr_board=nucleo_f746zg --project-option zephyr_base=ZEPHYR_BASE --project-option openocd_serial=OPENOCD_SERIAL