This is up to you. Since you haven't received the K3 the IRS hasn't either so they will process your return when it is filed with the information that you have.
If the K3 changes your return so that it would have reduced your refund then you will owe the difference back to the service at the time you receive the K3.
If you will receive an additional refund due to the information on the K3 then that second refund could be significantly delayed.
Whereas waiting means waiting on your original refund until you can file.
@rkaresh
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