I have SuperSU and I'm just wondering if I should unroot my phone then flash via TWRP kernel and then magisk. Am I right or not? Anyway I will flash it asa I get home and get answer . Good job OP
If you want to switch to Magisk then yes, it's ok to do that. Unroot from SuperSU, flash kernel and then Magisk. Be sure to backup boot partition before this process.