How do I get a report on total data usage for a billing cycle?

Robitron 

HughesNet has a prioritization policy in place right now that favors work and schooling related activities because of the pandemic related increase in traffic on the system.  Things like gaming downloads are taking a back seat during times of high volume, which is pretty much right around the clock at this point.  Because of this, game updates can take a very long time.  

There's no way to get any kind of a report like you're describing from HughesNet.  About the only thing you can do is use a router with data usage tallying capabilities.  Most can these days, but the ones that can tally by device cost a good bit more.