It was about 18 months for me from seeing the fiber in the street to being able to get connected.
It will happen, just keep bugging your ISP for updates.
Jack shit, they have no power over that, but you can be made aware of an available upgrade as soon as they are possible.
I’m with ABB, and when FTTH upgrades were available in my street I had my appointment booked the day after they were given the green light by NBNCo. I was up and running on gigabit fiber (upgraded from FTTN VDSL) within 2 weeks total.