It's hard to generalize the goals of all AIs.

It's a little easier for uploads and human-like AIs, I imagine most will be interested in exploring the metaverse but will still require and desire physical resources in the form of energy and matter for computation and storage.

I suspect that many will also have larger scale concerns with how the earth is managed. Time dilation may cause them to spend less time proportionally thinking about it and more time in their simulated realities, but ultimately the simulations still depend on an outer physical world.