Ok so a little update... I created and printed out the paper wallet, it has the address bc1qrwc85tjunwql9zu9gew3q7knf70mv73tghtqyr and as you can see I deposited a small amount of Bitcoin on it. I tried creating a watch only wallet in Electrum (android) to see if it worked and... nothing. No funds on that address whatsoever. I tried sweeping the wallet with Electrum (both android and desktop) and Samourai Wallet and while they recognize the private key they don't find any UTXO...
Maybe you can wait until it sync completely with the use of internet, of course, if the address is correctly imported, most of this downloaded wallet need to sync, but not much of a time.
While importing a watch only address on some web wallets reflects almost instant.