The coronavirus pandemic has severely affected education systems worldwide, and most US universities have moved to online coaching for the fall 2020 session. If you are planning to join an American university in the spring 2021 semester, be aware that this has a few downsides. So it would be a good idea to postpone your plans to the fall 2021.
Firstly, it will not be possible to give the GRE in July due to the ongoing lockdown, and the chances of giving it in August are also bleak. Therefore, it will be difficult to complete the application process before 31st August which is generally the deadline for spring 2021. Secondly, there is no guarantee that your visa will be processed in time or that you will be able to join for the spring semester.