Word of caution, the US border control is now requiring Canadians to get fingerprinted and reveal to them all of their personal data before crossing into the USA. Your cellphone contents will also get downloaded by US Border control and if they don't like anything that you have on your phone, you will be denied access to the USA. The Canadian Travel Association are cautioning Canadians to avoid all travel to anywhere in the USA unless it's essential travel, which means business travel only.
As far as your question is concerned, YES, there have been extensive delays in and out of JFK airport in New York because of air traffic control staffing issues which is a country-wide problem across the entire USA. Houston will be no different, regardless of what airline you are flying. Expect to experience extensive departure delays leaving Toronto for all flights bound for US destinations.
