I recommend using cutlery from the very start, but you’ll find that they don’t use them in anger until about 12m.
Much like cups, I’ve always been keen to move my children on to real cutlery, so I’ve offered them reduced sized metal cutlery as soon as possible.
Tommee Tippee do a great first set. Thay have bulky handles which are great for tiny hands.
IKEA do the perfect reduced size metal cutlery. I have about 10 sets! As the children get older, it’s important to have a set of identical sets so that the children don’t bicker over which set they have!