I think I saw one of your posts earlier and u r not an expired copr case.. this thread is filled with people whose copr has expired and that's what they would assume when they respond.. also, as most of our applications were processed in 2019 or beginning 2020, the information we share would be outdated.
Please try posting in AOR or ROH (ray of hope) threads..
To answer your question, yes you can get upfront medicals done before submitting documents after ITA.. this information was correct in August 2019 and has not been reviewed since