How to know the gradle process has ended?

I want to get the gradle running process where I can come to know that gradle task has ended.
I am executing gradle tasks parallel in my machines like following.

in Windows,
start gradlew runSuite1 -i --rerun-tasks
start gradlew runSuite1 -i --rerun-tasks
in Mac,
./gradlew runSuite1 -i --rerun-tasks &
./gradlew runSuite2 -i --rerun-tasks &

It will trigger all gradle operations in parallel.

I want to perform one operation once all this gradle tasks are ended.

How to know these gradle running process using java or anything ?

Thanks in advance