Other Middle East and Africa Frequent Flyer Programs - SAA terminal in FRA?

In July, I'm flying BRU-FRA-JNB with a relatively short connection in FRA (90 minutes) which should be OK except if the BRU-FRA flight is delayed (which happens of course).

Based on my experience of the FRA airport, it is not always easy to look up in which terminal is the FRA-JNB flight?

Do you know in which terminal/gate is usually departs from?

Thanks

SA leave from the B gates (terminal 1) in FRA. IIRC around B42 or something like that. 90 minutes should be plenty (unless, as you say, the BRU flight is seriously delayed).