Does your cert have an SCT? It would be strange for a Let's Encrypt cert to be missing it but certainly possible. Try running (replace both example.coms with your domain name)

    openssl s_client -connect example.com:443 -servername example.com </dev/null | openssl x509 -noout -text

which should print an SCT extension at the end - my version displays it by numeric identifier "1.3.6.1.4.1.11129.2.4.2" but maybe newer versions display it by name.

Alternatively, I think you might able to go to https://www.ssllabs.com/ssltest/ and see if your cert has "Certificate Transparency: Yes", but I'm not sure exactly what that means.

Anyway, I don't think this is related, the question at hand is about OCSP, which is a different mechanism from Certificate Transparency. (Arguably Certificate Transparency is a replacement for revocation in general being flawed in practice for many reasons, but they're different mechanisms.)