nmap output with awk to table

I'm trying to get nmap output as a table or at least straight columns. I'm using this command:

$ sudo nmap -sn 192.168.103.0/24 \
    | awk '/Nmap scan report for/{printf $5;}/MAC Address:/{print ","substr($0, index($0,$3)) }' \
    | sort -t . -k 4,4n

However, I want it to show me:

ip    mac address     hostname

without () around the ip or hostname, but I can't manage to do it.