Things moving faster and faster i Java nowadays. Soon we will get Jakarta EE 9.1 (Q2-2021) with support for Java 11 (latest LTS release).
Later next year Jakarta EE 10 plan to be released about Q2-2022. Read more about this in this excellent article Java for the enterprise: What to expect in Jakarta EE 10 by Arjan Tijms.
In standard Java is also moving on, Java 16 is already released and Java 17 will be next long-term support (LTS) release, planed for Q3-202.
What about products support för Jakarta EE 9, of course it take time for products to support new releases but anyway we already have these compatible products för Jakarta EE 9.