US/ Megacap growth stocks traded higher, with Nvidia NVDA.O, Tesla TSLA.O and Apple AAPL.O up between 0.5% and 1.4%. By Amruta Khandekar and Shristi Achar A Nov 10 (Reuters) - Wall Street's main indexes gained on Friday as investors assessed Federal Reserve Chair Jerome Powell's hawkish commentary and looked forward to key economic data next week for more cues on the monetary policy path. Powell on Thursday said central bank officials "are not confident" that interest rates are yet high enough to finish the battle with inflation and would not hesitate to tighten policy further if needed.