Does green card holder need travel document to go to Canada as of new law?

i don't have travel document but i want to know how long it will take to get the travel document if i apply now?

Your green card will be enough to seek admission into both Canada and the U.S.

Persons lawfully admitted to the United States for permanent residence who are in possession of their alien registration card (Green card), or can provide other evidence of permanent residence, do not require a visa to visit Canada.

Lawful permanent residents only need their green cards to return to the U.S. after a temporary absence. Permanent Resident Card, Form I-551, Legal Permanent Residents will continue to be able to use their Alien Registration Card (Form I-551), issued by the Department of Homeland Security, or other valid evidence of permanent residence status to apply for entry to the United States.

It would be smart to bring school ID, drivers license, or other things that show where you live and who you are.

Just have contact numbers for the people you're visiting and have their address if someone asks for it.

ANYONE travelling to Canada from the US needs a Passport.
2 weeks

You will carry you country passport and Greena card.
If you are refuge without passport you will carry refuge document with that

if you needed a visa to enter the USA, then you probably need a visa to enter Canada no matter that you have a green card.

which new law do you mean?