Correct way to maintain -current

Here's what I do:
every 7 days: pkg_add -u > pkg_delete -a
every 14 days: sysupgrade -s > sysmerge > fw_update > pkg_add-u > pkg_delete -a

1) When I do sysupgrade -s, I see that the system runs sysmerge and fw_update in that command automatically, so do I need to manually run them again after reboot? 
2) Is my time frame of updating packages every week and system every 2 weeks fine, or do you suggest something else?
3) Is there any thing else I should do?

Thank you