Shell Programming and Scripting

Code:

while read list
do

nohup ./process.sh $list &

process_id=$!

wait $process_id

done < sample.lst

command1..

command2..

//Am calling a shell script within and firing the multiple processes concurrently.

// I have to wait until all the above processes are finished and have to execute command1

//How do i assign the individual processes into a process id and wait

If i try the above code, will the processes gets triggered concurrently? or it wait for first process to finish and then start second process?

My requirement is to trigger all the processes to run in the background concurrently and wait for all them to finish. and then execute next commands in the main script.