I don't see harm in getting it now, but it depends on your preference. It acts like a normal sword with 30 attack power and crappy durability forcing a 10-minute wait between breaks. It is very useful against Guardians and Divine Beasts (deals double damage and its durability is greatly increased against those enemies).
Whenever I have my MS not at full durability (no sparkle), I use it against normal enemies/ore until it breaks and recharges so that I'll have a "brand new" one and leave it for when I encounter Guardians.
It's intended for guardian enemies and bosses. The base attack is 30 and when around those enemies or in Hyrule Castle the attack jumps to 60. There's no reason not to pick it up as soon as possible. You could even convert some stamina to hearts if you want to pick it up right now, and then convert those two hearts back to stamina after you get the sword.
Thanks! I cleared all shrines in the Forest and I was missing only one container, so I already have it