Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase.
Finest Hour’s second ability has an “intervening ‘if’ clause.” The ability won’t trigger at all unless it’s the first combat phase of the turn.
Unlike other similar cards, Finest Hour doesn’t create a main phase in between the two combat phases. The second combat phase will begin immediately after the current one ends.