Singtel runs Singapore's most extensive fibre network on the NetLink Trust passive infrastructure. Real-world speeds on Singtel plans are among the most consistent worldwide, Singapore's compact geography helps a lot.
You need a 2.5/5/10 GbE network adapter and CAT6/CAT6A cable. The ONT supports it; the bottleneck is your computer.
Even Wi-Fi 6 plateaus around 700-900 Mbps in real conditions. Use the Singtel mesh extenders or a third-party Wi-Fi 6E system.