Extremely high. There are a number of intelligent special on this planet right now: dolphins, elephants, whales, primates...
How likely is that there will be a sophisticated tool using civilization is a more interesting question. There are non human species that use tools[0], but they lack in sophistication. In order to start advanced technological civilization I think there are few conditions: ability to store information, ability to communicate information, and ability to utilize and improve tools.
There's also the primates that learned to modify sticks (i.e., peal off the bark) to stick in termite mounds, causing the termites to stick to the sap on the wood. This is an invented and learned behavior, but I don't know if there is any cases of a primate teaching another one this trick (vs. a primate picking it up by observation only).
How likely is that there will be a sophisticated tool using civilization is a more interesting question. There are non human species that use tools[0], but they lack in sophistication. In order to start advanced technological civilization I think there are few conditions: ability to store information, ability to communicate information, and ability to utilize and improve tools.
[0] Some primates use sharp sticks as weapons.