Can non-patent holders produce before the patent expires and then go public after it expires?

You can't. Non-patentees need the permission of the patentee before the patent expires to produce, and the patentee's permission can be obtained after the patent expires to go public. This is because a patent is the exclusive right to a specific technology or invention. During the term of a patent, no one may manufacture, use, sell or import an invention or product protected by a patent without the permission of the patentee. Therefore, non-patent holders need to obtain the patent holder's license before the patent expires, and continue to obtain the license after the patent expires before production and listing. Therefore, non-patentees cannot produce before the patent expires and then go public after the expiration.