On December 31st, President Trump extended the ban on entry for J-1 trainees or interns through March 31st.
President-elect Biden, who takes office on January 20, may or may not rescind it.
Remember that it typically takes three to four months to process everything. So if you want a trainee/intern to arrive in April or May–regardless of the extension of the ban–it’s a good plan to start the process now.