It depends. You certainly may begin to enter your information and save it so that when the other W-2 comes you'll be able to finish it quickly. But there is a really good reason to not send it quite yet.
Technically speaking, it's not legal to do so. Even if it were, you would have to amend your return after sending the return and confirming that the refund has been processed. To do this will take more time and potential aggravation then waiting a little longer and making sure it's done correctly. By law your companies should be providing you your Forms W-2 by January 31. Literally it should be in your hands any day, so the best recommended course is to wait on sending the return and have it done right.
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