Here are some links to coverage maps for NB-IoT and LTE-M in Scandinavia. The GSMA also has a global deployment map here:
https://www.gsma.com/iot/deployment-map/

Denmark

• Telia – https://www.telia.dk/privat/hjalp/dakning-og-drift/iot-dakningskort/

Finland

• Telia – https://www.telia.fi/asiakastuki/verkko/verkko/verkkokartta

Norway

• Telia – https://telia.no/dekningskart
• Telenor – https://www.telenor.no/bedrift/iot/dekning/#map

Sweden

• Telia – https://www.telia.se/privat/support/tackningskartor