Do Delta Connections follow the same nonrev boarding priority as delta (S3b1,s3c, etc)?
Do they clear nonrevs early, like at 1 hour prior to departure (instead of 20 minutes prior like we normally do)?
Are there other sources to see their availability and/or rules besides travel net?

My daughter checked in about 50 minutes prior to departure for an express jet flight and there was someone junior to me at delta (S3B1and later date of hire) and a DS (S3C) who were already cleared.