Oracle has officially released version 19c (premise release) 19.3 for Linux platform. The rest of systems like Windows and Unix (and its different portings) will have to wait for some days now.
You can download it from OTN (now renamed Technical Resources);
And also from edelivery;
If you have not had occasion to use a version 19 until now, I hope you enjoy it.
HTH – Antonio NAVARRO