Buy a cheap HomeKit compatible power plug; plug in the lamp, and then use Siri on your iPhone, iPad or Mac to turn the lamp on/off. Meross is a cheap option and will work immediately if set up through the Home app.
This was my initial thought, but I believe OP would need a device to be the HomeKit hub, such as an iPad, Apple TV or HomePod , the later of which OP does not have.
Many devices that use Wi-Fi will function without HomeKit or a hub, such as Wemo outlet switches.
The Wemo WiFi Smart Plug lets you control your electronic devices right from your phone or tablet. The Smart Plug uses your existing home WiFi network to provide wireless control of lamps, fans, and more—with no subscription or hub required. Simply plug the Smart Plug into an electrical outlet, plug a device into the Smart Plug, and control your device using the free Wemo app or by using your voice with Apple HomeKit, Amazon Alexa, or Google Assistant.*
You can also eliminate the phone, apps, etc. and just get a remote controlled outlet for about $15 US.
A part of me feels like I could go super simple like a remote control outlet or again, something like the clapper. I don’t have any current need to start an automated Home hub.
This isn’t the clapper but a remote “light switch” for an outlet (no Wi-Fi or automation, but it is straightforward). Got one like this in my kid’s room, it’s simple and solid.
DEWENWILS Remote Control Outlet Wireless Wall Mounted Light Switch, Electrical Plug in On Off Power Switch for Lamp, No Wiring,100 Feet RF Range, ETL Listed,Programmable https://a.co/d/1JXQrnW
take a look at the Ikea Dirigera Hub , it is the latest Hub that has thread and zigbee support and future prove to Matter in the future. It is compatible with their series of Tradfri smart bulbs and dimmers, switches, etc. Generally they are entry level devices but quite cheap
While the app may not be the most powerful, it is sufficient for most day to day use.