Definitely ready for topping.
Look for your strongest looking nodes.
Cut off the top leaving as many nodes underneath as you want.
Allow 1 week more veg after topping.
Select your 4 strongest looking nodes and cut off all the other nodes leaving your 4 remaining branches off the main stem.
If the nodes are uneven LST them to keep them at the same height.
This will force the plant to create your 4 mains.
Just before you switch to 12/12 strip off everything from the main stem up the branch and leave around 2-3 nodes on the branch from the main top down.
Then switch to 12/12 and wait for them to explode.
During the stretch over the first two weeks keep LST them a little to keep growth even.
That's it m8.
J