Today is planned the first hardfork for the GRIN crypto currency and more specifically its Cuckaroo29 (C29) algorithm to the new Cuckarood29, the C31 algorithm remains unaffected by this hardfork. Grin is expected to hard fork at Block 262,080 which is estimated to happen at some point today (July 17th, 2019). All you have to do to be ready to continue mining GRIN after the hardfork is to update your miner to the latest version, most of the software supports autodetection of the algorithm switch and thus should continue working jst fine after the fork happens.
The miners that have already released updates to support the new Cuckarood29 algorithm to be sued by Grin after the hard fork include: GMiner 1.51, NBMiner 24.1, lolMiner 0.8.5, nanominer 1.5.1 for AMD and or Nvidia GPUs on Windows and Linux operating systems. You can of course also use the official grin-miner 2.0.0 as well, although it is not available for Windows operating systems (only Linux and Mac OS X), unlike all of the other alternatives mentioned.