I will be traveling to Tanzania on 10 November 2019 and my transit for two hours in Zurich, Switzerland and will be back on 17th
Only citizens of a few countries need transit visa for airside Schengen transfer. Those are: Afghanistan, Bangladesh, Democratic Republic of the Congo Eritrea, Ethiopia, Ghana, Iran, Iraq, Nigeria, Pakistan, Somalia, Sri Lanka, Syria and Turkey, and only whey they do not have meet one of the requirements to get an exception of this rule.
Although as a citizen of Bangladesh you'd normally need an airport transit visa, since you are the permanent resident of US, you are exempt from this requirement. See https://www.eda.admin.ch/countries/usa/en/home/visa/entry-ch/transit.html and https://www.sem.admin.ch/content/dam/data/sem/rechtsgrundlagen/weisungen/visa/bfm/bfm-anh01-liste2-e.pdf