how can i get SYN value for new coection which is trying to open a url on Browser?

As I know that

'$sysctl | net.ipv4.tcp'

gives the system wide TCP parameter value,I need to make a script in Bash for my college practical file in which If we open Browser and input the URL such as www.google.com then SYN time of this coection establishment and SYN+ACK timing needed to take and compare with system wide parameter to take the decision for delay and display a message about SYN and SYN+ACK?