I'm in a similar position OP. I had asked the same question to
@LizzyM and it looks like if you don't have any shadowing hours, it's best to wait. I have some hours, but not the magical 150 that everyone talks about. However, I think someone said this above, if you have plenty of clinical volunteering hours, maybe some schools will be more lenient. AAMC is having a medschool virtual fair on Friday, you should go and ask these questions at the fair.
Now, if you live in a red state (like I do), Trump is saying he wants to lift the lockdown orders by mid April. Some doctors and hospitals may say it's ok for shadowers to come back, but then it becomes a question of "SHOULD you go shadow". Now we have ethical issues involved. Either way, just be careful and go to the AAMC virtual fair to ask your questions.