No need to postpone. Most Experts foreseen the virus will last for 45 days and the situation will be normal in upcoming days. When this happens the students will not be able to apply for admission immediately. In order to save the time, please proceeds with admission application, In fact, none of the college or university has stopped issuing the admission letters
If you are ready with admission letter, then will able to complete the visa application as when situation under control. Please note Fall will be the big intake for most of the countries.Entering in the Fall Semester has many advantages like part time and internships.
If we are postponing the planes, then mostly intake will be lost and may lose interest, distract etc.
Student career must move accordingly to timely manner plan. Hence definitely no need to post pone because of temporary issue