Yes, the fastest 802.11ac equipment on the market today allow PHY rates up to 1300mbps. With standard frame aggregation, they can just barely hit 80% efficiency, for TCP throughput of 1.04 Gbps, which is better than gigabit Ethernet's maximum TCP-over-IPv4 throughput of 941 Mbps (with standard sized 1500 Byte frames).
I've actually seen two 2013 retina MacBook Pros (which support the 1300Mbps flavor of 802.11ac) do 1.02Gbps of IPerf TCP throughput over Wi-Fi when one was acting as the AP.
When bridging from 1300Mbps AC to gigabit Ethernet through a typical consumer AP, you'll be limited to gigabit Ethernet's 941Mbps of throughput, but typically also have a little higher latency and a little less efficient frame aggregation, so you'll probably only see a little over 800Mbps of TCP throughput even in ideal conditions. But that's still pretty close to gigabit speeds.
Whether or not you can maintain the 1300Mbps PHY rate in your particular RF conditions (through the garage wall, etc.) is another matter, but 802.11ac gives you a fighting chance of having gigabit-like wireless performance.
You're not going to be able to get these speeds with an 802.11ac USB dongle, because those dongles usually only do the 867Mbps (2 spatial stream) flavor of 802.11ac, and a lot of them only use USB 2.0 for some inexplicable reason, limiting them to well under 480Mbps.
But if you put a 3-spatial-stream 802.11ac PCIe card in your desktop, like the ASUS PCE-AC66, and put a 3-spatial-stream 802.11ac router in your garage, like the ASUS RT-AC66U, and you position them well, pick a clean 80MHz-wide channel, and tune your TCP window size well, you have a fighting chance of getting 500-800 Mbps of TCP throughput between your desktop and your servers in your garage.