Your proxmox will just tell you:

2023-03-26 10:31:50 Logical volume "vm-1070-disk-1" created.

But what if you want to know the progress of the copy? In percentage maybe?

On the source host, find the dd job:

# ps aux | grep dd | grep 1070
root     2143046  2.6  0.0   2432   572 ?        D    10:31   0:04 dd if=/dev/BigStore/vm-1070-disk-1 bs=64k

Then do this:

kill -USR1 2143046

(We took the PID of the dd job there).

Logs will now show how much is copied:

2023-03-26 10:32:51 34585+0 records in
2023-03-26 10:32:51 34584+0 records out
2023-03-26 10:32:51 2266497024 bytes (2.3 GB, 2.1 GiB) copied, 62.3342 s, 36.4 MB/s