I have had it suggested to me that it can be useful to do a pretty good water change the day before shrimp arrive. Gets the water clean and gives the tank enough time to stabilize again before the shrimp are added.
For neocaridinas (which are hardy) I wouldn't worry about this type of stuff though unless you see an actual problem in the water readings.
What acclimation method do you plan to use?
I use something similar to this:
There are complicated chemical processes going on (gas exchange, ammonia build-up, etc.) that result in a focus on getting the shrimp in to the tank water in a relatively speedy fashion after opening the shipping bag.
With neocaridina there is quite a bit of wiggle room but it is worth reading that article, IMO, just to cover the basics. Even if you use a different acclimation method it will still give you a reminder on a few basics to help you avoid a 'doh' kind of moment.
You also won't want to feed the shrimp the first day. They likely won't want to eat until they adjust to the new tank and you don't want to add any more organic waste to the tank while they are still adjusting to it.
Your well established plants/moss/tank will actually provide a ton of mature bio-film and micro-fauna for them to eat and graze upon so they can survive a while on what is in the tank anyways.