As of now, the top 10 countries leading in the deployment of 5G technology are:

1. South Korea: South Korea was one of the first countries to launch commercial 5G services in April 2019.

2. United States: The US has been making significant strides in 5G deployment, with multiple network operators offering coverage in various cities.

3. China: China has invested heavily in 5G infrastructure and has the largest number of 5G towers globally. It aims to provide extensive coverage across the country.

4. Japan: Japan also launched 5G services in 2019 and continues to focus on expanding its network coverage.

5. Germany: Germany has been actively deploying 5G infrastructure and aims to establish a strong presence in the technology sector.

6. United Kingdom: The UK has been making progress in 5G deployment, with major cities already having access to 5G networks.

7. Australia: Australia has been steadily rolling out 5G services and is expected to have widespread coverage in the coming years.

8. Saudi Arabia: Saudi Arabia aims to be at the forefront of 5G deployment in the Middle East and has launched several commercial services.

9. Italy: Italy has been working towards 5G deployment and is among the leading nations in Europe in terms of network coverage.

10. Spain: Spain has been actively deploying 5G infrastructure and aims to provide widespread coverage, especially in major cities.

It’s worth noting that the rankings and progress can change over time as more countries continue to invest and develop their 5G networks.