Some people do their metadata in bulk. I don’t, I don’t have the patience. A big portion of my metadata is done during the import, but not everything can be entered during the import of the photos.
The 5Ws: What, When, Where, How and Why. I often need to answer these questions. One of them is the Where. I have a smart filter that allows me to identify what I have not entered. I work at it, in small doses. My smart filter catches the Country, the State/Province, the City and the Location. The important part is the Match any.
Lightroom: smart filter for no location meaning no country, state, province or no city
My alphabet is the standard Latin/Roman alphabet. You should change the alphabet to match your language.