I hope all is still going well and assume you will be adding the shrimp about now?
The new tank will have enough food for a few shrimps for a few weeks but you may want to add a small bit of snowflake for when you are away. It maybe best if you leave instructions to not feed the new tank (very easy to overfeed with only a few shrimps, plus they may not touch the food if there is plenty of yummy biofilm anyway) while you are away as there should be enough in the tank and if someone overfeeds then that could kill the shrimp and/or cause ammonia spike.
If you add a small bit of snowflake before your holiday that won't polute the water, but breaks down slowly.
Hope you have a great holiday!