@chris If you are already on XGS pon, then it is just a change in your profile and a few seconds of resync. If you're on Gpon , then they need to change your ONT/router (technically only a small component in it, the SFP needs changed). And at a position not far from your house, disconnect the fibre strand to your house from a optical splitter that leads to old GPON card in central office and connect it to a splitter that goes to a XGS pon card at the CO. fairly simple operation.

@jfmezei ya it should not be too much.
They'll be upgrading both the fibre terminal at the house as it is only 1Gbs as well as install their own router which I might not use but they are also installing their wifi APs around the house so it'll be a couple hours I imagine