Yes, i believe they came and prophesied back in the 1st century and what John saw and heard in his visions was retrospective of what had already happened the reason he was told to prophesy again, to all nations;So you believe the 2 witness in verse 3 already come to earth,
When? In what year?
3 And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
4 These are the two olive trees, and the two candlesticks standing before the God of the earth.
5 And if any man will hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man will hurt them, he must in this manner be killed.
Rev 10:11And they told me, “You must prophesy again about many peoples and nations and tongues and kings.”