How to setup certificate for duckdns

Running

-shellsession
user@nextcloudpi:/$ sudo certbot -d downwind.duckdns.org --manual --preferred-challenges dns certonly~

returned:

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    Please deploy a DNS TXT record under the name
    _acme-challenge.downwind.duckdns.org with the following value:
    
    to8BGF9LfNEOTdZkJAMUYoEd0rROw8Zwa6dumWVBIvA
    
    Before continuing, verify the record is deployed.
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Because I am trying to setup cert for DuckDNS, I tried [this](https://www.duckdns.org/update?domains=downwind.duckdns.org&token=MyDuckdnsToken&txt=to8BGF9LfNEOTdZkJAMUYoEd0rROw8Zwa6dumWVBIvA) . I'd like verify that the certificate is operational. Is there a command line test that can be remotely performed? UPDATE === SSL Checker returns: Does the result indicate a successful certificate install?