We appreciate the sensitive nature of this question.
As long as there is no access to mikva’ot or natural bodies of water, there is no way to immerse. (Pools are generally not considered fit for halachic immersion.) You should finish counting your clean days as scheduled. After they are finished, on Sunday night, you perform no more bedikot and switch to colored undergarments. You will need to wait to immerse as soon as there is a place where you can do so. Until then, you are still considered niddah and all the laws of conduct during niddah still apply.
You may wish to contact your local mikveh attendant to determine if there is any sense of when the mikveh will reopen or if there is any mikveh open within a reasonable distance.
Waiting to immerse can be a challenge, especially with an open-ended time period. We wish you and your husband the resilience and faith to negotiate this challenge with love and shalom bayit.