Actually, there is no “work from home benefit”. Instead, the CRA has made it easier for you to claim expenses related to working from home.
This FAQ shows where to claim your employment expenses in TurboTax Online: https://turbotax.community.intuit.ca/community/claims-deductions-donations/help/where-do-i-claim-my-employment-expenses-in-the-online-edition-of-turbotax/00/873421
This FAQ shows where to claim your employment expenses in TurboTax CD/Download: https://turbotax.community.intuit.ca/community/claims-deductions-donations/help/where-do-i-claim-my-employment-expenses-in-the-windows-edition-of-turbotax/00/873799
If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764