I emailed McGill about their prospective students day and they gave me a lot of information about the admissions process that may help clear up what is going on.
" Our recommendation to admit you will be forwarded to the McGill Graduate and Postdoctoral Studies Office for final approval. Once this process is complete, it may take up to 10 working day, you will receive a detailed letter of offer specifying any conditions you must still meet for admission (e.g. submitting official transcripts, confirmation of degree completion, proof of completion of outstanding pre-requisites) via the uApply system.
After receiving the official letter, please do not hesitate to contact us if you have any outstanding questions or concerns about your offer. "