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Whether the benefits are taxable or not is based on who paid the premiums. If the benefits are taxable, you'll get a tax slip to enter on your tax return. If you don't get a slip, then the benefits are not taxable and nothing needs to be entered on the return.

As per Sunlife:
Employer-paid short-term disability or long-term disability premiums are not taxable benefits. But any short- or long-term disability benefits you receive in the future from your employer will be taxable. Conversely, if all employees pay their own short or long-term disability premiums, any benefits they receive are tax-free. The same applies to premiums you pay for an individual policy you own. If you pay premiums yourself, using after-tax money, any benefits you receive are tax-free.