Question about mullein

Hello for those of you who are using mullein tea (or other preparations): how soon after starting did you see results you think the mullein brought about?
I am bringing up more mucus and coughing more thru the day & at night. I'm on a 3-month watch and wait with mac after I had mild hearing loss from the antibiotics.
So I'm wondering how to know if more mucus is a result of mullein helping clear, or a mild exacerbation.
(I see my BE team & get CT in mid-Feb to assess the 3-month watch and wait. And of course will reach out to them if needed.)
Thanks to all who so generously share experience here!