Upgrading Internet to Fiber

[Kekkaishi]

I have a 7 year-old gaming computer. I'm upgrading my internet connection from 500Mb to 2.5Gb.

My onboard/external network card currently support 1Gb.
After I bought a PCIE network card that supports 10Gb ethernet speed that has a PCIe x4 connector,
I realised that my motherboard only supports PCIe x16 and PCIe x1, so I can't connect the network card

Therefore I bought a "D-Link USB-C to 2.5G Ethernet Adapter" (also has a USB-3 connector).
I plugged it in to a USB-3 port on my PC and connected the ethernet cable from the router to the adapter (CAT7).
I checked the network adapter settings on Windows (Control Panel\Network and Internet\Network Connections)
and it still shows speed of 1Gb

Hardware Specs:

1. Old router that each of its RJ45 connectors probably support up to 1Gb speed
2. CAT7 ethernet cable
3. USB-3 to 2.5G Ethernet Adapter

I think the reason it shows maximum 1Gb speed even though I'm connected to an adapter that supports up to 2.5Gb speed, is that the router's RJ45 connectors support 1Gb? is that it?

I was told that when I upgrade to fiber, I will get a new router that supports 2.5Gb speed (only one of the ports)
I fear that when the technician arrives to install the fiber infrastructure,
my old computer along with my "USB-3 to 2.5G Ethernet Adapter" will not support the 2.5Gb speed

My final question is:
When I get the new router, along with a CAT7 ethernet cable and a network adapter that supports up to 2.5Gb.
Will I get a 2.5Gb internet speed? and if not, is there something I can do?

Thanks.

[john32123666]

This relies on your data plan, other network provider has limited/max-out bandwidth to offer ...
[This depends on how much bandwidth you are dealing with] ...
https://www.fusionconnect.com/blog/blog-archive/fiber-vs-cable-internet-a-guide-to-the-differences-in-speed-cost-more/
Best deal is to call them and talk to your ISP plan service ...
GOOD LUCK !!! ...