It indeed say "UPS Worldwide Saver®" however, looking at UPS' definitions that means. Bold added to the relevant lines. Only day definite service for Canada. Next Day only for US and Mexico. Which means us Canadians that are shipping today probably won't receive it till sometime Friday.
1-3 Business Days
Delivery by end of day
UPS Worldwide Express Saver
Delivery
Commitment
Export:
Next business day delivery by end of day to the U.S. and Mexico
Second business day delivery by end of day to major cities in Europe
Day-definite delivery by end of business day to other countries, depending on destination
Note: Collect on Delivery (C.O.D.) is only available when shipping to the U.S.
Import:
Day-definite delivery by end of business day from origin countries worldwide