You can send output to another terminal by redirecting to the correct /dev/ttyN or /dev/pts/N, where N is the identifier of the terminal or pseudo-terminal in which you want to print output. Suppose you have /dev/pts/1 open: you can do something like
39 0 * * * /bin/ls -al > /dev/pts/1
The problem is to determine which terminal is open/available. For example, you can write a little script which parses the output of the who
command and extract the relevant piece of information. Once the script has found all the available terminals, it will try to send output to all of them in sequence until the ls command exit successfully.