You definitely need to wait until you have cycled the tank properly, this means waiting until you have first measured non-zero amount of ammonia present in the tank.
When ammonia is present you need to wait until you can measure non-zero amount of nitrite in your tank.
When both ammonia and nitrite have dropped to zero and you are able to measure non-zero amount of nitrate in your tank, you can start to think about adding shrimp to your tank.
When testing your water please use a liquid test kit and not the 5 in 1 test strips as they are not very sensitive for ammonia and nitrite (as I just found out AGAIN).
I want you to read and understand what you read here https://www.fishlore.com/NitrogenCycle.htm before you even start thinking about adding shrimp to your tank.
I have just got myself about 20 red crystal shrimp and added them to a well cycled tank. No ammonia or nitrite is present in my tank and still I have found two dead so far, so you need to be patient before you add any type of life to your tank.
I have had aquariums since 1974 and until now and have gained some fundamental experience during the years. There are no shortcuts when you cycle a tank, it takes the time it takes depending on your setup.
Shrimp are very sensitive to the water quality, so if it is possible try to buy them from a shop that has the same water supply as you have at home.
