OpenSSH 8.4
From Github data, the overwhelming majority of all SSH keys added by users are ssh-rsa, which will be disallowed soon for older clients. Mind you there still a number of users with ssh-dss which is just comical.Remember that you can download the SSH public keys of any user on Github and run these statistics yourself.    https://github.com/linus.keys

Linus for example seems to have two keys, a 1024 bit RSA and a 2048 bit RSA.