The following sentence is from a text in which someone is complaining about his brother who has not been interested in his elderly mother. (Here is the link: https://www.insider.com/why-i-cut-contact-with-brother-sibling-estrangement-2020-5)
"I wouldn't be surprised if the next and final time I see my brother is at my mother's funeral."
One side of the sentence is would, and the other side of the sentence is present, which do not seem to fall in any of the conditionals, although it seems similar to Type 2. Thinking about the conditional Type 2, if one part of the sentence is structured with would, the other part should be in (simple past), but this sentence is not structured that way either.
So, what structure is it?
Is it really correct, or should it have been structure like this: "I wouldn't be surprised if the next and final time I see my brother WAS at my mother's funeral."