Indicate progress when importing settings

Please implement some sort of progress indication when importing configuration(!). Just displaying a note saying that it will take long, is not very helpful.
(This would generally be nice to have, e.g. when updating firmware)

There is a note that pops up briefly, saying one can use log viewer for this purpose. However, I don't see useful log outputs there.
Can you explain, how to use log viewer? How do I know it is still on-going?

Thx