Developer Beta Confusion

I installed the Big Sur profile on three of my Macs and installed. However, I am running 10.15.6 b2 on an iMac, didn't install the Big Sur profile on it, yet 10.16 showed up in Software Update. When/if there is a 10.15.6 b3 available, will it show up or am I stuck with Big Sur updates on the iMac?