That doesn’t look sturdy enough. At least add a third post. They can push hard, plus maybe reach their snouts through the openings.
I live among a lot of whitetail deer and use 5 foot tall welded wire (2x4 inch) cages about 30 inch diameter. They hold their shape very well with just a few weather resistant zip ties. We use a garden stake or whatever t post I’ve got handy to keep it from blowing over in high wind. It seems to do the job letting it grow up high enough to start the first scaffold above easy browsing height. The welded wire was pricey, but the circles are easily reused over and over for new trees. Liquid fence spray helps, too.
If the deer were starving I’d probably be less successful, but the food pressure isn’t too bad here most of the year.
They will get to the leaves when it grows out with that setup. They can poke their heads through
I use a ring of hardware cloth held up by a t post with additional bamboo posts (1-3) to prevent the hardware cloth from shifting in the wind. I’ve recently been moving to fiberglass posts and away from bamboo.
Author michael judd has said that with hardware cloth, the deer cant fit their hoof in like on standard welded wire to reach up higher.
I’ve used chicken wire too but it is more flimsy and I’ve had to double layer the rings to give them more rigidity.
I have found that if the tree gets bigger if it bounces against the hardware cloth, it will tear at the bark, so now I also utilize Tree Pro Tree Protectors in addition to the hardware cloth to help prevent scaffolding too low and to protect the trunk. it also helps prevent damage when I pull the hardware cloth off to string trim around the base of the tree. Accidentally girdling jujube trees that have outgrown deer protection