Apostle Peter said: “‘But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day…’ (2Peter 3:8,10)” What is the true meaning of this it was intended to convey?

This was not a description of some kind of time travel technology such as developed by the extraterrestrial civilizations in your galaxy, but solely to provide a divine clue about the nature of what the divine realm can do, even when interacting with the physical plane containing incarnated humans. It has been made clear in the Scriptures that we are superhuman, or more accurately, suprahuman. We are not constrained by time at all, in the sense that you are as physical beings. So, we can expand time as needed to carry out interactions and manipulations in ways that are quite difficult for humans to understand or appreciate and we can compress time as well to, in effect, traverse vast stretches of time to go where and when we choose, to observe, share experiences with all involved, and perhaps do some kind of intervention to provide a benefit. So these words in the Scriptures are literally correct but are describing the capabilities of the Creator and divine beings and indirectly providing a divine hint we have explained to you already, that time as experienced by the human civilization is an illusion, both in appearing to be strictly linear in proceeding in one direction, and in seeming to be quite precisely uniform and never wavering.