The usual bottleneck for self-hosted LLMs is memory bandwidth. It doesn't really matter if there are integrated graphics or not... the models will run at the same (very slow) speed on CPU-only. Macs are only decent for LLMs because Apple has given Apple Silicon unusually high memory bandwidth, but they're still nowhere near as fast as a high-end GPU with
extremely fast VRAM.
For extremely tiny models like you would use for tab completion, even an old AMD CPU is probably going to do okay.