how long will they support the stable? that's what my question was about. Now i have one F3 and i am good with this. And dont want to change. But i am affraid about the privacy and banking apps in the future if they will not support at least the security patches.April 11, 2021 it looks like according to Sourceforge. You can look yourself to be sure. All previous builds are on Sourceforge at the link in the OP.
If you don't already have one, I probably wouldn't consider buying one at this point if I were you. Its succesor, the F4 has been out since last summer already.