How to run TOP cmd in parallel while running other command in a script?

Question

I have some sync bash command. What I want is run TOP cmd while running a command to see a performance of a system while executing the command. Obviously this 2 cmnds should be running in parallel and both finishing when sync is done:

(top -b | grep init >> top-output.txt; // this is top command (maybe need to be changed)
$JFROG rt dl $src --insecure-tls=true --flat=true --retries=6 --threads=14 --sync-deletes=true --quiet // this is sync command it works good

now how to combine them to run in parallel and log top command.