How to know the boot time (kernel + init) in Alpine using openRC?

I made a bit of research on the matter and also asked ChatGPT, but there doesn't seem to be a way to measure full boot time of an alpine distribution with OpenRC. Using dmesg, I can see the last message [ 0.689037] Run /sbin/init as init process But I want to know how much time it took to "complete" the init process. My use case is boot time sensitive, that's why I'm asking. Note I was able to boot an ubuntu 22.04 with systemd in 1s including kernel boot. In systemd, systemd-analyze is very useful. So I hope there is an equivalent (or a way) in openRC.