Before oneAPI, when you installed MKL for MacOS, the path
Could you try searching for libraries under $ONEAPIROOT/compiler/latest/OS/compiler/lib?
For instance, in Linux, libiomp5.so is present under the directory /opt/intel/oneapi/compiler/latest/linux/compiler/lib/intel64_lin/.
I have not heard back from you, so I will go ahead and close this thread from my end. Feel free to post a new question if you require further assistance from Intel.