You can have dd show the progress of a write by specifying “status=progress” in the command line arguments.

sudo dd if=Downloads/CentOS-8-x86_64-1905-boot.iso of=/dev/sdb status=progress

Example:

bob@localhost:~$ sudo dd if=Downloads/CentOS-8-x86_64-1905-boot.iso of=/dev/sdb status=progress
559690240 bytes (560 MB, 534 MiB) copied, 96 s, 5.8 MB/s    <-- This is shown while writing.
1093632+0 records in
1093632+0 records out
559939584 bytes (560 MB, 534 MiB) copied, 96.0339 s, 5.8 MB/s