By Rae Wee SINGAPORE (Reuters) -The dollar was on track for its best week against the yen in three months on Friday, after Federal Reserve Chair Jerome Powell and a chorus of Fed officials poured cold water on market expectations of a peak in U.S. rates. In cryptocurrencies, bitcoin and ether held near multi-month highs, with renewed speculation over the imminent approval of an exchange-traded bitcoin fund breathing new life into the digital assets. A slew of Fed policymakers including Powell said on Thursday they are still not sure that interest rates are high enough to finish the battle with…