The phrase 'it is highly probable that' is correct and can be used in written English. You can use this phrase to introduce a statement that is likely to be true or accurate. For example: "It is highly probable that this new technology will revolutionize the way we work.".
But due to the severity of its wounds, it is highly probable that the infant died.
Thus, it is highly probable that grease or its components played a certain role in foam formation and stabilization.
In fact, it is highly probable that he was involved in its formulation or its approval".
It is highly probable that the referendum will be decided by them.
If a disguise works in one place, it is highly probable that species elsewhere will have tried it, too.
The judge added: "It is highly probable that the children were made to perform sexual acts on animals".
It is highly probable that atmospheric movements, governed by well-defined equations, are in a state of chaos.
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MA of Applied Linguistic, Maquarie University, Australia