(Reuters) -U.S. stock index futures edged higher on Monday as Tesla and Apple led gains in megacap companies, while investors exercised caution ahead of the Federal Reserve's interest rate decision later in the week. Apple added 2% after a report that the iPhone maker had renewed discussions with OpenAI about using the startup's generative artificial intelligence (AI) technology. Focus will now shift to the Fed's interest rate decision due on Wednesday, ahead of a key jobs report on Friday that could set the tone for market direction in the near-term.