As it is not yet generally available as something the public will install, and given how long it can take for a wide userbase to upgrade, this support wouldn't mean being able to set gif's EoL to any date soon.
Unless you refuse to let Safari hold you back as IE6 did for so long (and to an extent newer IE versions still do depending on you target audience - in my day job I have no choice but to support IE 8 and 11 to this day). Though if that is the case then you've stopped actively supporting Safari already.
As it is not yet generally available as something the public will install, and given how long it can take for a wide userbase to upgrade, this support wouldn't mean being able to set gif's EoL to any date soon.
Unless you refuse to let Safari hold you back as IE6 did for so long (and to an extent newer IE versions still do depending on you target audience - in my day job I have no choice but to support IE 8 and 11 to this day). Though if that is the case then you've stopped actively supporting Safari already.