The helm utility will be required to install the helm-chart in the k3s cluster.
First find out latest stable release of helm here. Replace this with LATEST_STABLE_VERSION in below url. Once done then download the binary and install on the system.
wget https://get.helm.sh/helm-LATEST_STABLE_VERSION-linux-amd64.tar.gz -O /tmp/helm.tar.gz
tar -xvf /tmp/helm.tar.gz -C /tmp/
mv /tmp/linux-amd64/helm /usr/bin/helm
chmod +x /usr/bin/helm
rm -rf /tmp/linux-amd64/ /tmp/helm.tar.gz