We understand that quarantine presents a number of challenges, and appreciate your commitment to following the instructions.
Generally speaking, mikveh immersion can only take place at night. In fact, a mikveh attendant often is required to receive explicit halachic permission from the supervising rabbi before she can open the mikveh during the day.
We need more details about your situation in order to determine if there are sufficient grounds to allow for daytime immersion. Please get back to us with more details, by calling our hotline, or contacting a local Yoetzet Halacha.