I’m pretty sure they’re rated for 1000 cycles. Idk if that’s good or bad. Or what’s expected to happen when it’s beyond that.
https://support.apple.com/en-us/102888
Most recent Macbooks should last for 1000 full cycles. Though I'm pretty sure you can brick your battery quickly by keeping it at 100% charge all the time or if you use it in a very hot environment.