RavenDB 5.0 release train is gathering steam as we speak. The most recent change to talk about is the fact that you can now deploy RavenDB 5.0 beta in RavenDB Cloud:
This allows you to start experimenting with the newest features of RavenDB, including the time series capabilities.
Please take a look, the RavenDB 5.0 option is available at the free tier as well, so I would encourage you to give it a run.
As always, your feedback is desired and welcome.