I've tried running molotov to burn a certain ISO. This is the console output:
Umounting /dev/sdd and /path/to/the.iso
Removing /tmp/tmp.VwB7JENmGT and /tmp/tmp.6Rko9YGEGb
Removing file system signature from /dev/sdd
Writing new partition table for /dev/sdd
Partition #1 contains a ntfs signature.
Formatting /dev/sdd1 with NTFS
Mounting /dev/sdd1 at /tmp/tmp.6Rko9YGEGb
Mounting /path/to/the.iso at /tmp/tmp.VwB7JENmGT
mount: /tmp/tmp.VwB7JENmGT: WARNING: source write-protected, mounted read-only.
Copying iso contents to /tmp/tmp.6Rko9YGEGb/
The I see a percentage start to climb. It climbs to 84% very quickly - within a few seconds. Then it sits at 84% for... maybe 5 or 10 minutes, I didn't time this exactly. Then it goes to 100%. Then it installs grub, which for some reason takes a lot of time - which is not reflected in any percentage/progress count. At some point I gave up and came here to write this bug report...
Edit: ... eventually the grub-install concluded successfully, but it took a lot of time.
So, bottom line: Progress reporting needs to improve in terms of all of update resolution, scope and accuracy.