It is really hard to answer that question without some more data…but it is a big jump in FTP in a relatively short period of time. That said, you note that you are relatively new to cycling, so big gains are possible…but it is a big leap
My personal advice is to not worry too much about setting time goals for your first 70.3…there is a LOT that goes into racing a 70.3 well and setting time goals for your first race is pretty tough and adds incremental stress. (But we all do it, I know…)
I will say this…depending on your height / weight / position (and course profile), your time goal is quite possibly achievable with your given FTP. I went 2:19 at Muncie in 2017 with ~260 FTP. Now, that is a fast course and I have a pretty good position, but it is possible.
I would encourage you to focus on the work and not set an arbitrary FTP number as a goal. Make your goal process driven (complete HVIM Build program, etc) and let the outcome be the outcome.
Oh, and run more. Run 6 days a week, some really short and easy, some longer, some tempo.