SQL Developer 19.2 is released and it supports TimesTen version 18.1 (both TimesTen Scaleout and TimesTen Classic). The key change in SQL Developer 19.2 from the previous SQL Developer 19.1 is JDK 11 is now supported. For more information about TimesTen support in SQL Developer 19.2, see SQL Developer for Oracle TimesTen Release Notes. Click here to download SQL Developer 19.2.
Disclaimer: These are my personal thoughts and do not represent Oracle's official viewpoint in any way, shape, or form.