The employer McKinsey Consulting Company will issue a certificate and apply to the US Department of Labor for changing the temporary status of employees to employment status. When you have worked for more than two years, and you have used up H 1b in the first three years, apply for an extension of H1B. After you get the second three years, the company will start to apply for a green card for you.
A green card is a permanent residence permit for foreign citizens. Holding a green card means that the cardholder has permanent residency in the issuing country, and can be exempted from entry visas for a certain period of time. The green card originated in America. There are still many ways to apply for a green card in the United States, but the examination is strict.