You definitly need to wait until you have cycled the tank properly,This means waiting until you have measured first ammonia present in the tank.
When ammonia is present you need to wait until you can measure nitrite in your tank.
When both ammonia and nitrite have dropped to zero and you are able to measure nitrate in your tank you can start to think about adding shrimps 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 shrimps 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 from 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 have the same water supply as you have at home.