Check the bidb website, and the cityfibre checker.
They are very slow compared to openreach, to give you an idea of timescale, they started in my city around 2 years ago, they also came within 20m of my property around a year ago, and as you may guess, its not rolled out to my property yeet, however all this time my property was planned in their checker, hence you need to check the checker.
When you get anywhere near activation the checker will change, but that can still be several months away, as an earlier reply stated there can be quite the gap between the works been completed and activation. So if you only have the basic "we will let you know" on the checker (without the unplanned part, if it says unplanned then forget it), then just go renew your existing broadband for a year or two as they probably wont be done any earlier then that.