Traveling to Peru - is this a good itinerary?

Hi, I’m not sure if this is allowed but I wanted to opinions on my trip to Peru in early September. This is my tentative plan

- Wednesday: fly into Lima arriving late at night

- Thursday: spend the day in Lima exploring

- Friday: fly to Cusco; we are planning on doing a five day guided tour to Sacred valley, Machu Picchu, rainbow mountain

- Tuesday: tour ends and fly home

My questions are

Am I missing anything?
Does the timing of this sound right?
Will we be sorry not getting to Cusco a day earlier for acclimatization?
We have the opportunity to add treks to Huayna Picchu, Machu Picchu Mountain, or Huchuy Picchu Mountain. Are any of these worth it? If so, which?

Thanks in advance for any advice!