100% of 4 Pros
Applying to American schools still is worth it if that's what you want. Experts say that a vaccine is likely by 2021, so the US will hopefully be able to return to normal by then. Even if that doesn't happen, you could still get in-person education at a lot of colleges as long as you follow the proper safety and social distancing procedures.
Deferring acceptance is always an option but you won't have that option without applying. Hopefully a vaccine will be available by then, but you can always evaluate the situation closer to Fall 2021 once you are accepted.
In present situation, all the countries are hit by this pandemic and hopefully, with the research going on by all the scientists and doctors we are not much far to have vaccine. Wherever you are interested to apply just go forward and apply, you can later decide upon going further as per selection.