That would be today, IIRC. I think there is one bugfix queued for v7.9.21, which is likely to be the last ever in the v7.9 family. Only security fixes, if any, for the next two years.
If you don’t have a plan to move to v8.1, you should correct that.
It’s now in the “Limited” support phase (described somewhere here). Not even security fixes are covered. It means you can still get help from tech support but development of any kind has ceased.
There will be one final v7.9.21 release.